Here's a useful reddit thread to learn more about using objects in RenPy games. I found it so helpful myself that you can see I commented ;)
/ tutorial_object_oriented_programming_and_r...
Sound Assets in the games shown are credited as the following:
Music: https://www.purple-planet.com
Free License Music: https://taketones.com/
Royalty Free Sound Effects: https://www.fesliyanstudios.com/