Learning resources

There are lot of resources available on internet in order to learn ctf,i am attaching some links here.
Link Description
CTFtime Compete ctf contests across all over world (Recommend)
ctf-katana A very good archive to learn all type of ctf-categories (Recommend)
RootOfTheNull Youtube user who provides writeups of ctf competition
Tools Useful tools for competing CTF
Reading-material Time worth reading material (Don't miss)
Reverse_engineering Tutorial for Reverse Engineering (MUST WATCH)
Into. to RSA A Introduction to RSA Crypto System
Forensics A good Github Repo for Foresics category.
reversing.kr Specifically for Reverse Engineering
pwnable.tw Specifically for Pwning