okeanskiy, he makes in-depth and advances tutorials that range from OOP to Terrain Generation to Chunk Algorithms. Really good for experienced and advanced scripters.
There is no such thing as best along the lines of tutorials. There are multiple specifics and it is heavily subjective on what the tutorial is addressing. Learning from experience is better than the theory on its own.
I use this a lot as it has all the class references and articles on how to do different things.
Forget a functions spelling or what exactly it does? Wiki has it.
I learned Lua back in 2011-2012 on Roblox after having been programming since 2007. So with the base behind me, I started editing scripts on Roblox and seeing how they worked, reading through it, until I was able to make my own scripts from start to finish.