YouTube channels
YouTube is a great resource, where researchers and bug bounty hunters upload videos with proofs of concept and presentations about computer security. The following are some of the most valuable channels that are useful for a bug bounty hunter.
Web Hacking Pro Tips
This is Peter Yaworski's YouTube channel (https://www.youtube.com/channel/UCS0y5e-AMsZO8GEFtKBAzkA); here, you can find some of the material described in his book Hacking 101 with demos and more proofs of concept. The valuable thing about his channel is that there are basic and advanced videos, so all bug bounty hunters can take advantage of the material published.
BugCrowd
BugCrowd has created a section in its YouTube channel named BugCrowd University (https://www.youtube.com/watch?v=OVr7pnwJ2m8&list=PLIK9nm3mu-S4K4jMHwtplbrE1JMg0jyN-). This video explains the different concepts in bug bounty hunting, using the Bug Bounty Hunter's methodology in an introductory way and promoted by BugCrowd.
HackerOne
HackerOne...