I have spent the last 10 years of my life playing Couter-Strike. I remember the old 1.6 days where you looked for hours for players and available servers in order to play competitive games. Later on sites like ESL were a big deal and I was so happy I had the opportunity to play a couple of seriuous games (of course there were a lot of trolls and griefing on there but more than 2/3 of my games there were good!)
Maybe nowadays players can't appreciate what a big milestone the competitive matchmaking system is for the whole Counter-Strike franchise I would ask you now to think for a moment a bit differently about the matchmaking system even if you hate it and just bare with me.
There are plenty of sites like ESEA, Faceit, Leetway where the probability of experiencing a quality game is higher than with matchmaking, but it isn't about how these sites are better or so, it is about why we as a community allowed them to exist, when we have a BUILT IT matchmaking, where you can find a game sometimes in a matter of seconds.
There is a tendency in the competitive CS world from a long time and it is the fact that above 80% of players competing on a higher lever are doing it on those platforms and not on the official matchmaking servers. Why is that wrong? Let me tell you: imagine if everybody played matchmaking seriously. Imagine if matchmaking was really a place, where you can see how your skills improve. Imagine if you would come across professional players on the higher ranks daily, because they are playing matchmaking, not ESEA or such! What we are doing, is destroying a great system, which could become the best solution for competitive Counter-Strike gaming. We get away from something, which was made specifically for us and our quality experience. No matter how much you go on about how Valve is taking our money and blah the matchmaking system is something, which could give us only positives, if it was used properly. Wouldn't it be great if the matchmaking was a place where everybody was really playing competitive and with respect and we wouldn't have to go crying for good games on third party sites?
You might point out that this is an issue in every online game and yes, there are maybe no games with open commuinities, which don't suffer from abusive, toxic or clueless players. However, this guide is about CS:GO and the way we play this single game. Coming up with the argument "what do you want, all games are the same" is as valid as an argument like "every country has problems with drugs, why try solving them at all?" If you get my point, the best we could do now is be concerned about our own game and how we can make thing better here.

At this point you may think I am delusional, and guess what, it may actually be true, because we are so deep in the sh*t I doubt it can all be changed for the better. You know what I am talking about... just how many times have you rage quted or even deinstalled CS:GO because of teammates:
"Buying AWP on eco and rushing B with it" ; "Don't buy a single grenade the whole game" ; "Have zero feeling for the game and how it works" ; "Do not communicate with you in any single way" ; "Die and then flame you with the typical 'Why no help?'"
Are you f*king tired from the ♥♥♥♥♥♥♥♥ Russians (sorry to the few Russians, who can actually behave themselves and play good), trolls, hackers and every other sort of idiotic scum playing matchmaking? Well I f*king am!! That's why I am writing this f*king guide on how not to be a f*king toxic sh*thead on CS:GO competitive matchmaking!

From now on I deeply encourage everyone of you who understands what I mean agrees with what I am about to say to support my initiative and add #RespectMatchmaking to your nickname.

This goes to all advanced players, or people who think they can play better than average: it is absolutely 100% pointless to flame weaker players. There is a difference between a f*cker, intentionally griefing around and playing stupid because they think it is funny and a newcommer, who is actually trying to do something, but still isn't succeeding.
Think about this: imagine you were back in school and were sitting on your desk during class. Now think about situations where you made a mistake in your writing, or sayed something wrong, or scored only a few points in a test. Now imagine if it would bring something and how you would feel, if the tacher came to you like: "WTF are you doing, you stupid noob pupil! Get the F*CK out of this classroom! OOMMGG you lame stupid sh*t, go clean some toilets!"...... Wouldn't be very good huh? Now you might be laughing, but yes, that is exactly how a person new to the game feels when you start swearing at him every time they do something wrong.
Don't get me wrong, I am not against criticism but only if it is constructive and given in a positive way! There is a difference between saying: "OMG nice spray noob, gg!!" and "try controlling the spray with mouse down next time ;)"
I know that you get angry when you lose because of weaker players, but constantly flaming them won't make them magically become olofmeister only because you swear at them. The best you could do in this situation is, if you are too mad to encourage them, at least don't say anything! Trust me, most weak players already know they are weak and other negatively pointing it out doesn't make anything better. Even if you encounter people playing bad intentionally "because of fun" try keeping it calm, because you know "don't feed the troll" ;)

In games like CS good team communication can be the difference between win and loss. To communicate with your teammates is an essential part of success. Pressing the "k" key and giving information is almost rule number 1. However, this activity is so much left behind under the presumption "it won't bring anything" or generally forgotten, especially in the lower ranks, that it is almost shocking.
You admire the professionals, right? Have you ever tried listening to a recorded ingame conversation between teammates? If yes, then you already know how insanely much they communicate and how every players knows everything about what his teammates are doing, where the opponents are and what the plan is. Now campare this to an average matchmaking game. How many times have you came across people who communicate with eachother properly and know when and how to use the microphone? Exactly this is a big issue.
There could big a number of reasons why players don't communicate:
1. You don't have a mic - yet you do have a keyboard, right? Write in the team chat or use radio messages (yes, it's not stupid, it is actually quite useful if you don't have a mic.)
2. "Why sould I say something if nobody else does" - do you want to win? Then why don't you be the one who first says something.
3. "It won't bring anything, if we are losing, then we are losing" - keeping your mouth shut and letting the game slip away won't bring anything either. It could only get better if you try to keep the communication going.
4. "They see what is going on, why should I bother giving info" - can you read minds? The fact that you think everybody is aware of what is going on in the game, doesn't mean it is true. What you are doing is you are thinking, that somebody else is thinking something... Let your teammates know what you know. Tell me what you see and what goes on where you are.
5. "I am too shy to say something out loud" - come on now, you are sitting at home probably and are playing with people you would most surely never see in real life. What is the worst that could happen if you use the mic?

Now after we got this out of the way here are some guidelines to correct team communication:

1. During the freeze time - this is the time when you all should discuss what the next move is and what the best plan for the comming round would be. A HUGE MISTAKE is to just wait for the freeze time to end and go into the round without any plan or agenda and just "wait to see what happens and how it all turns out"

From now on every time you say something is should be as short, clean and informative as possible. Don't say "OMG this f*cking d*ck on B is so lucky, what a coincidence, I hate that guy, I shot him like 20 time" could easily be replaced with a simple "Killed me on B tunnel, guy is low / couldn't hit him." and then be mad when you are not on the mic as long as you want.

2. When you are changing your current position / changing the place where you planned to be at the beginning - inform your teammates where you are going and what you are planning on doing there.

3. When you spot an enemy. Inform the others where he is standing / where he last was, how many were there. "For example when you are awping mid as T on Dust 2 you have 2 tasks - trying to hit someone AND informing your teammates how many enemies are going B.

4. When you die - inform where and from who.

5. Planning during the round should be short and informative, for example "Go long now, enter with smoke and flashes" or "B clear, bomb"

Constructive criticism, discussing what went wrong / was good and any other sort of information should be sayed out loud after the round has ended.

Oh yes, the Gold 1 player's favorite weapon! :D Sorry about that... let's get to business:

The short answer : if you have less than 1000 hours in CS:GO don't buy an awp in competitive games at all! Yes, it's that simple. This is a very hard weapon, which demands a fine sense of moving, organising your game and playing correctly with it. No, you do not know hot to play it properly and you are screwing up your team. Just practise it in Deathmatch or common games / massacre servers and watch tutorials / professionals playing AWP until you get somewhat of an idea how the weapon should be used in competitive gaming.

The long answer : there are a couple of huge mistakes, which novice players are doing when it comes to buying / playing with AWP:
1. If you aren't specifically planning as a team to do some special tactic, so to say if you aren't buying on purpose, 1 AWP in the team is enough!
2. Don't buy an AWP if your team's economy as a whole isn't that great and if you insist on buying at you should kill at least 2 people with it in that round, otherwise what you did didn't help your team at all.
3. Don't hold the bomb if you are playing AWP. I have experienced so many situations where awpers just hold on to the bomb and then get killed from another awper and then bomb drops at such a place, where it couldn't be picked up any more, because there is a ♥♥♥♥♥♥♥♥ awper waiting for you there, so you have to sacrifice a smoke.
4. DON'T BUY AWPS ON ECO OR EVERY TIME YOU HAVE THE MONEY FOR IT!
FFS! Guess what, if you had bought an ak or m4 and lost the round, maybe next round your team would still have enough money to buy rifles again, but noo, you bought a f*cking awp, then lost the round (because you can't play it, or because if was not correct to buy an awp in that situation) and now you have exactly 50$ for that f*king Decoy greande you are going to throw at your teammates after you buy it.

I am sorry for the caps and the overall negative tone of this section, but I think that certain people (all of you, doing exactly what I listed) need a bit stronger "tap on the shoulder" in order to realise what they are doing is wrong.

There are 2 types of self-oriented players. The ones who do whatever they want, because they think they are better than everybody and the ones who somehow find frags more important than a win.

To the first type:
I am not declining the possibility that you might actually be better than everyone else in the team and know all the right moves, strategies and action. The problem here is that you don't inform your teammates what you want to be done and somehow expect from them to know what you are up to. This is the typical situation where a guy runs alone into a fight without informing anybody, then dies of course and says "why not help, idiots". How do you expect help from anybody when you didn't say at the beginning what you were going to do but went out there alone because if knew only for yourself this is the right way to play? If you are that great then try becoming the team leader and lead you team. Let me say it agan, LEAD them, INFORM them what the best option, move etc is. Don't expect anything from anybody only because you know it and you think it is the best thing to be done.

To the second type:
You know what, at the end of the game, nobody except you cares how many frags you made if you lost the game and didn't contribute to the team. You are not being worshipped by anybody for your skill to play a "one man army" game, hide and seek frags. Yes, sometimes, very rarely a very good player is able to outscore everybody and the served and win the game for his team, the so called "carrying" if this is what you imagine you are doing. Well, you aren't carrying anybody except your ego! There is a difference between having many frags because you were this great entry fragger and was all around the map killing people and making opening possibilities for your team and the sneaky, selfish, teamplay-destroying fragging you are doing. There is a difference between helping your teammates and getting many kills in the action just because you are great, and getting many frags because you cared more about you not dying and killing enemies.

So you play for fun? Okay, no problem with that. But let me tell you that fun means something different to everybody. If you find running around like an idiot, shooting and blinding your temmates, playing scout and deagle and overall being a d*ck on the game funny, I and many others find it annoying, destructive and inappropriate for competitive matchmaking.
I am the last guy who would try to stop you from playing a game for the sake of "fun" but competitive isn't the place for that. I get it. After a rough day you come home, connect with a bunch of friends online, grab a beer and just want to have some ffun time! I get it, believe me. But the problem is, there are so many different community based servers, like zombie, jalbait, minigmes, arms race and I don't know what else and many ways to have fun in CS:GO and not destroy the quality experience of other people, and yet so many on you decide to come have their fun on competitive matchmaking!
When you are searching for a competitive match, you want to COMPETE, not F*CK AROUND.
If you don't want to play seriously, its fine! Just give many others a chance to do it.