Cacher is the code snippet organizer for pro developers

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CTF's
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http://overthewire.org/wargames
https://www.hackthissite.org
https://picoctf.com

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WriteUps
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https://ctftime.org/writeups

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Attack and defence ctf's
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Web based testing pages
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https://www.hacksplaining.com/exercises

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OTHER
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https://ctftime.org/ctfs
https://registration.cyberwargames.net/cybersprint


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MINDMAPS
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http://www.amanhardikar.com/mindmaps/Practice.html
https://forum.bugcrowd.com/t/researcher-resources-how-to-become-a-bug-bounty-hunter/1103/1