Here's just a few great sources of information on community cats

Alley Cat Allies

https://www.alleycat.org

A source of information about feral cats and TNR.

Neighborhood Cats

https://www.neighborhoodcats.org

Another source for TNR information.

WebMD for Pets-- Information on Stray and Feral Cats

https://pets.webmd.com › Healthy Cats › Reference

Resources from Best Friends on helping Community cats

https://resources.bestfriends.org/advocacy/community-cats