Ray casting is a popular graphic rendering techniques in the 90s, used to render semi-3D worlds in many games. These repository contain demos for the ray-casting tutorials at permadi.com.
When I was new to programming, I focused way too much on learning the syntax, especially the brackets, the semicolons, and ...
This tutorial explains how to download private videos & playlists, or rather: videos you need to be logged in for. I can't guarantee this will work for every service out there, but it for sure works ...