As described on the website,

"Welcome to the Commons Social Change Library!
Do you want to change the world for the better? You’ve come to the right place! Whether you’re new to advocacy or an experienced campaigner you’ll find helpful resources here. All materials are free, digital, and directly available.
The Commons Library includes 1000+ educational resources in a range of formats. Topics include campaign strategy, community organising, working effectively in groups, justice and diversity, creative activism, and much more."