I need some advice about how to code an enigma2 plugin, I am a python developer

I need help:

1- what is the best environment to debug the plugin code, I hear a bout enigma2 PC , but I don't know how to do that??

2-what is the suitable way to learn about enigma2 plugin coding

thanks in advance

thanks, sir

and why plugin contain two python files

.py file

and .pyo file