Links To Explore

here i share the link which is worth to update your skills
1.indiabix.com 
here you can sharp your aptitude skills well
2.youtube.com/iit
all video lecture of all iits in India almost u get everything here
3.http://www.hci-class.org)  
Human-Computer Interaction from Stanford university 
4.(http://www.modelthinker-class.org) 
Model Thinking Registration from Stanford university
5.http://www.security-class.org/
computer security class from  Stanford university