That shall be a sticky post to collect good YouTube Channels in the comments to learn DCS World Modules.
https://www.youtube.com/@TheOpsCenterByMikeSolyom/videos
Tactics and Procedures, Tutorials for general DCS Stuff
My favourites:
https://www.youtube.com/@CasmoTV Casmo - Great Ressource on the Apache and other Helo Stuff.
https://www.youtube.com/@volkvoort Volk - Great Tutorials and Hints for using the KA-50 Black Shark
https://www.youtube.com/@BogeyDope Bogey Dope - Short and very helpful Tutorials for the F-16
https://www.youtube.com/@deephack Deephack - General DCS channel with many good Tutorials on a whole Bunch of Modules
https://www.youtube.com/@DCSDigitalCombatSimulator Fox3 Simulations - Tutorials on different Modules, General DCS Stuff
https://www.youtube.com/@thewarthogproject The Warthog Project - Great Simpit and hints how to build your own.
https://www.youtube.com/@RedKiteRender RedKite - General DCS and Tutorials on many modules.
https://www.youtube.com/@ralfidude Ralfidude - General DCS Stuff and Tutorials for the SU-25T and A10