Yup, you can pretty much think of Lua as are-bones C without pointers and with limited typing (essentially, everything is either a double or a string, and the only complex structure is the table, which is essentially an array/list and a hashmap/dict rolled into one, inside which everything can coexist)
.
If you have a specific query/interest, we'll be happy to point you in the right direction, because as @pazos mentioned, the biggest hurdle is likely knowing what's responsible for something in particular, rather than the programming language(s)
.