What educational content of Youtube should you watch?
TED TALKS

https://www.youtube.com/user/TEDtalksDirector
Short and easy to understand scientific, techonlogical, entertainment and design concepts. It's fun and won't take up much of your time.
SCI SHOW

https://www.youtube.com/user/scishow
News in the Science world - easy and fun.
CRASH COURSE

https://www.youtube.com/user/crashcourse
Lectures about various topics - for the general populace.
VERITASIUM

https://www.youtube.com/user/1veritasium
Fun scientific experiments, interviews and demonstrations that will surely intrigue you.
MENTAL FLOSS

https://www.youtube.com/user/MentalFlossVideo
Lists, fun facts, debunking misconceptions, questions answered... Really all you need for a fun and educational afternoon.
MINUTE PHYSICS

https://www.youtube.com/user/minutephysics/videos
Sketches of Physics explanations - the easiest way to understand some topics, other than witnessing them in person.
P.S.
For more you can always go to Related Channels on the side of each page.
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