Blog post –> AEM: AC Tool or How To Manage Groups & Users
Quite a comprehensive guide which covers the following topics: * What is it and why do you need this tool * Setup * Migration * Best practices how to organize project structure to most of the AC tool * Configuration basics
Do not hesitate to say thank you to Oleksandr in the comments here!!
Try to check other articles here Bots & AEM corner. Lots of useful posts about various AEM topics.