Hi and welcome!
You can find a brief explanation of how LÖVE works
here, with some more in-depth tutorials linked at the bottom of the page.
If you don't know Lua, though, I'd suggest starting to read
Programming in Lua. It's aimed for a previous language version (Lua 5.0) but even though LÖVE uses a different one (LuaJIT, based on 5.1) it will still be fine, as most things didn't change.
If you need any help, you can ask in the Support and Development forum (be sure to read the guidelines before though! Don't worry, they're short
), but don't be lazy! Try searching on Google and figuring out what the issue might be on your own, it'll help you in the long run.
I had a last point but I kinda forgot it while writing. Have fun