For noobs & experienced players:

Weapon Advantage, usage & control:
https://www.youtube.com/watch?v=wtYGGNh1CtU

Showing some rail positions/angels on a few maps:
https://www.youtube.com/watch?v=FPjZjs27z5U

For experienced dm13 players:

How to effectively trap your opponent in LG room and how not to be trapped too hard yourself:
https://www.youtube.com/watch?v=egLMOJNGWmI