Also, best free ways to learn a scripting language?

BrickPlanet's scripting language is Lua. I recommend looking at simple scripts that other people have created and learning how they work before attempting to create your own. Lua is easy to learn and incredibly popular, thus there are numerous resources available online to help you learn it.

Basic Lua introduction:
https://youtu.be/jUuqBZwwkQw

Learning Lua Playlist:
https://www.youtube.com/playlist?list=PLYBJzqz8zpWavt37pA6NANJTGStIHpybU

Lua docs:
https://www.lua.org/start.html

BrickPlanet docs:
https://docs.brickplanet.com/index.html

Lua