If you want to stand on top of the food chain - you need learn from the best and get even better then them.
Hint: Some of these tutorials are focusing on competitive play in ns2, but they are still extremely helpful for normal pub-play! The main difference is that mistakes will be more forgiven on a public server.
Field Marine Basics by Warforce17
Skulk Training (2015) Starting with Walljump explanation by Golden
Skulk Biting RTs and Facingdirection by Wob
Lerk Training (2015) by schu
Fade - Showcase effective Fade Movement with Explanations by loMe
Fade - Decisionmaking before Engaging Thread by rantology
Fade - Training (2015) by loMe
Gorge Basics Tutorial [For Public Play by Luftwaffe]
Other / Special
Map usage / rotations / laning by loMe
How to take Engagements by AQUA5
Optimal Positioning and Hivepushspots by Trademark and loMe
Voicechat behaviour by Mega
Russian Tutorial Videos (Includes Trickjumps!) by CRaZyCAT
HowToSeeLifeformEggs by Bicsum/Mega
Other Tutorials in ENSL Forum
If you’re willing to improve yourself, you have watched / read these tutorials, but still have trouble?
You can find here a list of people who are willing to help, in order to improve yourself.
Just add one in Steam Friends and state them your reason for doing so.
(Otherwise they might just delete you from their friends list again)
Do you think there is a tutorial which is missing or you’re willing to support players as coach?
Then contact us at email@example.com
More basic Information can you find on the official Natural Selection 2 Wiki Page.