Bronze:
Play EZ champions who can carry.basics are your best weapon.
Focus on farm. That's the most important mechanic in the game. If I found the shittiest player on the world and got him to cs perfectly, he would probably be g5. They will walk int you and you will kill them. Fight to survive and not to kill necessarily.
Stfu. Your bronze so you know nothing. Also try this command: /muteall. If you fuck up, you will be flammed alot and tilted. Just use pings instead of chat and don't flame. It's not always your teams fault, you also suck. You will have bad games where
you will facepalm.
Pick 2 roles and 3chapions for each role and make sure you also have 3 supports. Fucking autofill
The a rune/mastery page for your champions and be sure to copy pros
Silver:
Again play strong an EZ champions
Work trading into your cs patterns
Again only use pings
Watch high elo games past the 10 minute Mark
Back after every teamfight/objective
Those are the basic things. That's how you escape. Keep trying and you will climb.