Last but not least, when you learn at least C++, look at the LUNI documentation here:

https://docs.google.com/document/d/1v9GB1gNwO0C81Rhd4imbaLN7z-R0zpK5sYJMbxPP3Kc/edit?pref=2&pli=1#heading=h.q55eiu5cro7b

This explains the way different parts of the LUNI source code works.

Hopes this helps developers!