If you want to improve your game and are a new player or veteran, there's something to take from all of these videos and most of the concepts/ideas from videos about 1.6/Source can be applied to CS:GO.

>Useful websites and maps/How to practice
Read and watch everything here: http://pastebin.com/UmC1Vsnh
Spray control: http://steamcommunity.com/sharedfiles/filedetails/?id=419404847
Aim: http://steamcommunity.com/sharedfiles/filedetails/?id=137263564 http://steamcommunity.com/sharedfiles/filedetails/?id=243702660
DM Servers: http://fragshack.esea.net/index.php?s=servers
Smokes and Flashes: http://www.thewarmup.net/

>For absolute beginners
https://www.youtube.com/watch?v=ekQzMlnYq4w

>How to be good at CS:GO for all skill levels
http://steamcommunity.com/sharedfiles/filedetails/?id=121447468

>How to aim better
https://www.youtube.com/watch?v=PsSsxWlTEPQ
https://www.youtube.com/watch?v=U9mvXfnY8wU

>Curse Pro Tips (many more available separately on Youtube)
http://steamcommunity.com/sharedfiles/filedetails/?id=142687770#135024

>cArn's Theory of Counter-Strike (ep. 1-6)
https://www.youtube.com/watch?v=RkX_wKRWp9Y&list=PLD6F513CF5F1040BF

>Vanilla Games (pro POV demos with in-game sound)
https://www.youtube.com/user/vanillafeature

>How to Clutch
https://www.youtube.com/watch?v=CnoG1s6XmLs

>How to Break Bad Habits
https://www.youtube.com/watch?v=65oTInp3yXM
https://www.youtube.com/watch?v=VwRsdzzgW1c
https://www.youtube.com/watch?v=xGOqbvdKvQE
https://www.youtube.com/watch?v=1Xgo3AYx_ow
https://www.youtube.com/watch?v=hQz0oN9W15s
https://www.youtube.com/watch?v=Kd7anaqEXBc

>Valve Protips (old but still good for new players)
https://www.youtube.com/watch?v=3zzLHeqcW8w&list=PLSXFSBSGcg47aWkGDg5El6OM2cstwRRvT



>1.6 Vids (concepts still carry over to CSGO):
https://www.youtube.com/watch?v=ul3kHt-a-5E
https://www.youtube.com/watch?v=UuEPyYS7wf4
https://www.youtube.com/watch?v=rAlE2zLWgFs
https://www.youtube.com/watch?v=H3I5yamzDT0
https://www.youtube.com/watch?v=n7ZOlcgQOmM
https://www.youtube.com/watch?v=Q2yAOaowA8c
https://www.youtube.com/watch?v=94cx7LMuL7c