Guide sites?

What's wrong with mobafire? Here's what I do with a new champion: Play it in normals in the desired role. Build how I think it should be built with items and abilities and see how I do. Then go on mobafire and check multiple builds to see what other people do and compare to what I did. Some guides even include tips on how to play the champion and show combos.

probuilds.net gives you the builds the pros use.

champion.gg gives you the builds with the highest win percentages in plat+ play.

I tend to use my knowledge of items along with the recommended build. If I do research builds, I use mobafire, lolking, probuilds and/or solomid

I just use probuilds.