I made a tool that allows you to find the mathematically correct build for any champion (also includes a Practice Tool simulation where you can attack any champ instead of a dummy) :
LoL Builds - League of Legends - Apps on Google Play
Finally made it to 1,000,000 points. As much as I love this champion, I think I won't touch him until he gets a buff. GG! : r/Aurelion_Sol_mains
Kalista Build - Top winrate & pickrate - LoL Runes, Items, and Skill Order
Championify v0.0.3 - Champion.gg builds imported in game! Now with Skill Priorities and Garena support! : r/leagueoflegends
Miss Fortune support sees play rate spike after Worlds appearances - The Rift Herald
S13 - LoL Champion Builds, Runes, Pro Builds, Counters Guides
U GG: The Best League of Legends Builds LoL Build Champion Probuilds LoL Runes Tier List Counters Guides
Champion.gg - Corki Middle Stats, Builds, Runes, Masteries and Counters | Runes, Maple leaf tattoo, Leaf tattoos
Detailed Corki Midlane guide for Patch 11.6 : r/CorkiMains
Yasuo Build for Mid with Highest Winrate, Guides, Runes, Items