https://www.youtube.com/watch?v=tQcw1DjMj7w&list=PLFo8L3yruNpFjn2_SsCiQyxmnZib8QbNB&index=4
He does this job very good and explains very well. Also he verified by Garry.

https://www.youtube.com/watch?v=opqduWmdpEo&list=PLrUY-5TMELbdLXXVaIvIbP7qogJVPAypr
He doesn't have many videos to compared Hosomi but he has helpful videos. Also he making new videos about every update.

https://www.youtube.com/watch?v=pdSDojRatHw&list=PLHSLq5FjjRw0mC-roui0E04GOl9Dnf-Yd&index=2
https://youtu.be/DmsQEhTBHps?list=PLHSLq5FjjRw1LUlWzL9qWB7mdqzu5GRzv
They have big, detailized tutorials series for Source 2 on youtube. Also they making Let's Build Series.

https://youtu.be/nfIW_2sDphc?list=PLI4MD48gtUt-a_RalnK_bvYk-OPxlrIh7

A list of some videos on youtube for mapping i found: https://www.youtube.com/playlist?list=PLnGh43dlf-JL8WeFdbJq_ECLKL3TfRAkU

Yeah that's all about it now. New channels are coming out day by day...

TopHatWaffle's Site
https://www.tophattwaffle.com/downloads/

In here you can find anything what you want. BSPsource, GCFscape, Propper etc.

https://www.youtube.com/watch?v=RL_bVZHRm4s Porting Materials & Models but different way (not very healty, sometimes don't working at this point bcz. source2utils is new and developing already.)

https://github.com/caseytube/source2utils For converting folders.

https://www.python.org/downloads/windows/ Download Latest Python 3.

https://www.youtube.com/watch?v=FaVEZA-rm5g Porting Models