Cybersecurity: where to start

Good introduction to web hacking: https://www.hacksplaining.com/

Learn Python http://www.pythonchallenge.com/

Current events blog: http://arstechnica.com/security/

Good range of problem solving challenges: http://www.hacker.org/

Practice from easy to impossible: https://pentesterlab.com/exercises

Vulnerable by design VMs: https://www.vulnhub.com/

Programming challenges: https://www.codewars.com (join clan “Void Star”!)

Get paid for finding public exploits: https://hackerone.com/hacktivity/popular

Problem challenge site: http://overthewire.org/wargames/

Former CTF questions archive: http://captf.com/practice-ctf/

When you want more: http://www.amanhardikar.com/mindmaps/Practice.html