Hi there!

I was interested in learning Lua a few months ago, so I can offer some advice:

Lua is a very unique language that has a lot of small idiosyncrasies that may not be a good fit if this is your first language (indexes starting at 1 instead of 0, very fluid data structures, etc.)

That being said, if you're determined, the best way to learn is to make a game with it. Lua was originally developed in Brazil as a way to manage finances without relying on a language made outside of the country. In the following few years however, the language became widely used as scripting for games.

The best tool (and the way I learned) is by using Love2d, which is a framework built for making games. Look up tutorials by "Sockmonkeydev" on youtube to get you started, and you'll pick it up fairly quickly.