Good Videos and Lectures -- Through the eyes of an compuational biochemist
 
Computer
 
Hardware
 
Linux
 
Algorithms/Programming
 
Science
 
Theoretical and Computational Chemistry/Statistical Mechanics
Experimental Techniques
Basic Science
If you may feel that you you need some basics before taking
the more advance courses above, I would recommend the following:
  -    Professor Dave explains  
 
  This Youtube-channel covers many different fields of science (mathematics, chemistry, physics, biochemistry, biology ...)
  starting at a beginners level but also going quite deep. The beginning of many of the video seem a bit childish,
  but the content of the videos is quite good.
    
  -  3Blue1Brown 
 
  This is another page with a youtube channel with very good content on mathematics
Physics
Chemistry
Biochemistry
Biology
    
Mathematics
 Entertaining Science