**youtube channels :
arabic competitive programming : https://www.youtube.com/user/nobody123497/playlists
solvertobe : https://www.youtube.com/channel/UC2xOPGjIhLKsgUZEiunlzWQ/playlists

**training sheet : http://bit.ly/2OVv05u ( make a copy of this to modify )
video explaining the traning sheet

competitive prog platforms :
codeforces (must have !!!!)
UVA and SPOJ (must have for the training sheet)
cs academy , hacker earth , A2oj ,Topcoder , hacker rank ,codechef ...

**interesting website :
geeksforgeeks : https://www.geeksforgeeks.org/fundamentals-of-algorithms/#AnalysisofAlgorithms ( must see )