how do you get better in games

Youtube tutorials, watching Pro's livestream and how they play. And just generally getting loads of practice at the game. Reading some guides can be useful too then trying the tipps from them out.

Practice. watch how pro players play the game, take the time to realize what your weaknessesare, and work on them.

Watching streams or videos helps with game sense, playing helps you get better mechanically.

Usually playing them more helps improve your skill xD

I usually use youtube tutorials, not all are good but some are enough to learn tricks

Walkthroughs, see how they play/strategy.
Practice makes perfect

Playing SNES Super Mario World got me better at pretty much every game That I play lol.

you can go through walkthroughs at first. try without walkthroughs at the start, then use walkthroughs as you progress, then try to speedrun the game lol.

When you start playing Counter strike, Minecraft, overwatch, others... You don't play those well in the first time, soo you only need play they more often, you will get better with they, you just need play more and soon you will improve.

Die, Die, Die... and then die some more :D. Honestly most of the time I get like 20 kills and 5 deaths. Then in the next round 5 kills and 20 deaths its always random lol.