How does memory work in java?

Question

Java

Hello, I would like to know about how memory works in Java, where what is sent and after that. I read several sources and where it is written simply about stack and heap , where about several generations and iterations of the garbage collector , and where something else is attributed to these generations
Threat in the answers there is a link to a video that just explains the difference in information in different sources

Answer 1

https://docs.oracle.com/javase/specs/