So first you have to know something about basic binds.
For Example : bind <key> <function or +function>
+ makes that function will work when key is hold.

Now let's talk about toggle binds.
For Example : bindtoggle <key> <function that can be toggled>
When you click <key> and function is enable it will become disable, and inversely.

Incrementvar binds are not so much known as normal binds, but they are usefull.
For Example : bind <key> "incrementvar <function> <min. value> <max. value> <how much add per click>"; bind <key2> "incrementvar <function> <min. value> <max. value> <how much "delete" per click>"
If you click <key> the value will get higher, and if you click <key2> the value will get lower

Aliases are pretty simple. Alias = creating a command.
For Example : alias <+name> <+functions>;alias <-name> "-functions"; bind <key> <+name>
And if you hold key, you will do functions in the same moment. If you relase the space you will stop jumping and ducking.

5. Aliases that works like lever , are something like toggle binds, but you can do 2 different things.
For Example : alias <name> <name1>; alias <name1> <functions1; alias <name> <name2>; alias <name2> <functions2; alias <name> <name1> bind <key> <name>
When you click key the funtions1 will works, and when you press it another one time, funtions2 will works.