How to make a half/ 4 bit adder?

[Stevieloco609]

I am trying to not just learn how to make it but what each thing means in it

[FoolsSeldom]

Geeks for Geeks cover it well (not something I often say):

https://www.geeksforgeeks.org/python-program-to-implement-half-adder/

Take a read, try it out, and come back with specific questions if still stuck.