Yes, Youtube can be an immense source of important information. As long as you exclusively watch educative videos. Sorry, No more cat videos for you.
An example of a YouTube Channel with educative videos is Google Talks. Posted in this channel are videos of authors speaking to YouTube employees.
*To save time train yourself to listen to them at 2 times normal speed.
Instead of watching movies watch documentaries.
Movies are exclusively created to entertain you. Documentaries will entertain you and teach you.
*To save time train yourself to listen to them at 2 – 3 times normal speed.