Learning resources

There are lot of resources available on internet in order to learn ctf,i am attaching some links here.
Link Description
https://ctftime.org Compete ctf contests across all over world (Recommend)
https://github.com/JohnHammond/ctf-katana A very good archive to learn all type of ctf-categories (Recommend)
https://www.youtube.com/user/RootOfTheNull/videos Youtube user who provides writeups of ctf competition
https://github.com/InfoSecIITR/tools Useful tools for competing CTF
https://github.com/InfoSecIITR/reading-material Time worth reading material (Don't miss)
https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/videos Tutorial for Reverse Engineering (MUST WATCH)
https://en.wikipedia.org/wiki/RSA_(cryptosystem) A Introduction to RSA Crypto System
https://github.com/trailofbits/ctf/tree/master/forensics A good Github Repo for Foresics category.
http://reversing.kr/challenge.php Specifically for Reverse Engineering
https://pwnable.tw/challenge/ Specifically for Pwning