League of Legends (LoL) Question: what is the best way on how not to tilt in games

Don't type in chat. Mute people immediately if they bother you at all. There's no easy way to deal with your emotions all the time, but you can stop it from going in chat and on record. If you have enough self-control to not type and not intentionally feed or afk when you're angry, you won't get banned or chat restricted at all.

I find music helps me, as does taking a short break between games. Other than that, just try and focus on improving and don't put too much importance on winning any individual game. It's easier said than done, but if you get in the right mindset it's a lot easier to play through losses.

Let me repeat what the people from above said:

TURN. OFF. YOUR. CHAT.

What PsiGuard said + I'll add turn off All Chat in your settings if you find that you need to. Almost nothing the opposing team says is relevant to you doing what you need to do to win the game.

With respect to breaks between games, again I agree with PsiGuard short breaks after games are good. Think about making some notes about the game. How did the match-up go? Get invaded and give up first blood, what happened? Could you have flashed over a wall?

If you lose two games in a row, especially ranked games, take a long break. Play another game. Play an ARAM and focus on your team fighting or something like that.

You most likely will never play with the 4 other people on your team again assuming soloqueue. It is about improving yourself and your game, not what your teammates are doing

Winning lane, but the rest of your team is having problems? Take your tower, push out the minion wave and look to rotate to other lanes to make plays.

Are you getting trashed, but have some CC? okay, then you are CC bot that peels for your teammates that are doing better or use it to set up picks and then come back and peel.

Also if things look ****py in champion select (e.g., someone insists on Galio support and you can feel your neck start to tighten up at the thought) then dodge.

Psy cover almost everything, but u need to say to yourself most of the people arent pro (and even pro do mistakes ^^) so your going to do mistakes the key is to focus in to improve and remebr MUTE is the key !