Using MITRE ATT&CK for Cyber Threat Intelligence Training by Katie Nickels and Adam Pennington of the ATT&CK team will help you learn how to apply ATT&CK and improve your threat intelligence practices.
The Better Internet for Kids (BIK) Team has worked on a user-friendly factsheet which collects and summarises, in a few pages, the main content of the articles of the DSA that focus specifically on the protection of children and young people online.