As T1 said, op.gg is a very good tool for winning games.

I use it every game now too look up my team mates before a match, to know whether its worth dodgin or not.

If you see one of your team mates has a 35% overall winrate (best to judge if they have 30 or more total ranked games) probably best to dodge. If you have a team mate that is on a massive loss streak, probably best to dodge. If you see you have a team mate whos playing jungle and you notice he goes AP and out of 50 games has a 29% winrate on , probably a good idea to dodge.

Any way people, use OP.GG and save your self LP (ha it rhymes)