YouTube Channels

There are many YouTube channels out there that showcase penetration testing/hacking techniques. A few worth bookmarking are:

IppSec Provides an extremely in-depth walkthrough of every retired HTB box packed full of insight from his own experience, as well as videos on various techniques.
VbScrub Provides HTB videos as well as videos on techniques, primarily focusing on Active Directory exploitation.
STÖK Provides videos on various infosec related topics, mainly focusing on bug bounties and web application penetration testing.
LiveOverflow Provides videos on a wide variety of technical infosec topics.