“At a Glance” book collection made by WADA explain in a easy manner some concepts and procedures related to doping, therapeutic use exemptions, doping control process, etc.
Here you will find them all and other interesting resources like the Athlete Reference Guide to 2021 Code. If you have any doubts of just feel like exploring more in deep any other concept you will find more information, resources, and webinars in the ADEL website.