Networking
Eli The Computer Guy: https://www.youtube.com/user/elithecomputerguy
Networking white hat tools: https://hakshop.com/
How to do subnetting: http://turfptax.com/wp-content/uploads/2018/05/268147-TURFPTAx-Explains-Subnetting.pdfhttp://turfptax.com/wp-content/uploads/2018/02/268147-TURFPTAx-Explains-Subnetting.pdf
Microsoft Applications
Did you know that a library card in some cities grants you access to Lynda.com for free?!?!
Lynda.com: https://www.lynda.com/
Windows Operating System
Linux Operating System
CodeAcademy: https://www.codecademy.com/
Programming
Improve typing speed: https://typing.io/
python: https://automatetheboringstuff.com/
Math/Numbers:
Numberphile: https://www.youtube.com/channel/UCoxcjq-8xIDTYp3uz647V5A
Computer Concepts:
Computerphile: https://www.youtube.com/user/Computerphile
Cryptography:
Khan Academy: https://www.khanacademy.org/computing/computer-science/cryptography
This course is very fun and may be helpful for the puzzle on this site 😀