Here is a cheat sheet for all Riven Mod challenges: https://docs.google.com/document/d/1PpHG1jkVK59Kmx4J_yqqpzLZknft_Q-_ExzncGaAM2w/edit#heading=h.lk2h9uyqpl65
Features open one at a time and things will change under you. If something is broken or could be better, use the glowing feedback button in the corner of any page and say how you would improve it. That is where reports are read.
Here is a cheat sheet for all Riven Mod challenges: https://docs.google.com/document/d/1PpHG1jkVK59Kmx4J_yqqpzLZknft_Q-_ExzncGaAM2w/edit#heading=h.lk2h9uyqpl65