Welcome.
I understand how capitalism works, and I have doubts that it is a sustainable system for society long term,
You are 100% right
What I am interested in learning is how society would operate and function under socialism / communism
First, socialism and communism are different. Socialism only aims to socialise production, meanwhile communism aims to socialise both production and consumption.
Secondly, how society would operate and function under socialism depends on what kind of socialism the society embraces. Socialism isn't just one kind. There is market socialism, socialism with planned economy, and socialism with mix of market and planned economy.
Meanwhile how society would operate and function under communism usually follows the teachings of Karl Marx, Friedrich Engels and Vladimir Lenin.
Edit:
- Adding "Meanwhile how society will operate and function under communism usually follows the teachings of Karl Marx, Friedrich Engels and Vladimir Lenin."
- Change "how society will operate and function under socialism" and "how society will operate and function under communism" to "how society would operate and function under socialism" and "how society would operate and function under communism"