I wil share here some important topics, concepts in OOP learned and coded in C++
Here is the github link where I will update regularly my learning.
https://github.com/zakilive/OOP-Basics-with-C-
For embedded systems the OOP project I made recently:
https://github.com/zakilive/ArduinoOOP_Light_AND_PIR_Sensor
In python, I have some implementation of OOP can be found from this blog post I had written before.