Learn where we learned over at W3 Schools.
Practice writing real code with code Academy
Visit a CoderDojo and learn more
Free courses for kids by Pluralsight
Learn about the Linux Terminal
An article by securitybaron on the importance of cryptography.
The Conscience of a Hacker
Scan files for ASCII text
A common tool for hiding files in images
A list of handy tools complied by MrMugiwara
A bash terminal with git for Windows
A Password Cracker
Lists of common passwords
There are a lot of great CTF platforms out there, here are a few we have seen
Building challenges can be one of the hardest parts about running a CTF
After our CTF you can continue to learn by visiting these other CTF's