Returning for season 8 after a few months/years of not playing League? This post will help you get up-to-date with the meta and all important changes made within the past four years. :
Lulu Meta Sheet: All viable Lulu runes and builds (Patch 11.11) : r/lulumains
Ultimate Lulu guide: Best League of Legends builds, runes, tips & tricks - Dexerto