Well put together resource that teaches how the PowerPlay update works and how to actually use the new system.
https://docs.google.com/presentation/d/1A7K-q-n5GUjTdJE8WEm5ULsZ064bwHRPktN1eAub3Q0/present?slide=id.p
https://docs.google.com/presentation/d/1A7K-q-n5GUjTdJE8WEm5ULsZ064bwHRPktN1eAub3Q0/present?slide=id.p