Hacking:
https://pentesterlab.com/
https://hackerrank.com
https://seclists.org/
https://defendtheweb.net
https://pentesterlab.com
https://www.offensive-security.com/labs/individual/
https://www.hackthebox.com/
https://www.blackhat.com/
https://defcon.org/
https://www.vulnhub.com/
https://www.root-me.org/?page=news&lang=en
https://overthewire.org/wargames/
https://hackthissite.org/
https://portswigger.net/web-security
https://www.codingame.com/start
https://tryhackme.com/

Coding:
https://www.theodinproject.com/
https://www.freecodecamp.org/

Advanced Courses:
https://www.coursera.org/
https://www.edx.org
https://ine.com

Parallel Computing
https://hpc.llnl.gov/documentation/tutorials