i dont know if this common or anything but as the scout is so squishy i use a mad milk and wrap assassin combo. if you get milk on someone then bleed from wrap on that same target it basically just becomes free health regen

Another tactic: use the gunslinger's third punch crit to take out the first enemy in your way.

Remember to dodge bullets and projectles with crouch jump, strafing etc. But in teamfights it may be better to soak up damage for your teamates' sake especially if you have a lot of health (like soldier, heavy, overheal)

As a Spy, if you're near a friendly Dispenser, you can remain cloaked with the regular watch like a Cloak and Dagger. I use Dispensers on the front lines to always be able to see my enemies.

if you use the gunslinger as engi and hit a teamate two times repeatditly the hold alt fire( default should be mouse 2) you can hold the third crit punch. this can be used to insta kill spys eyelander demos medics sniper ans other engies in one hit