This walkthrough goes through HackerOnes CTF and illustrates SQLi and other issues. This video was made by Bilal Kohgadai, an independent security researcher and pentesting enthusiast.
Bilal writes code, builds, and monitors networks - all while aiming to help others. His mission is to try to bring his varied experiences to keep users safe, build more secure systems, and learn along other talented people.
Learn more about Bilal's activities on his security blog: https://bilk0h.com/
Check out his GitHub as well: https://github.com/bilkoh