Playwright internals: how does it work?

Hey all, I was wondering if there is a resource to learn how playwright works internally? Docs are great to understand how to use playwright, but leaves some questions I need to answer.

Examples:

1. How are playwright instructions like await mouse.click(x, y); sent to the browser?
2. What are the differences between using connect and connectOverCDP. When should I use one over the other?
3. When using languages like C#, it seems like a nodejs version of playwright is launched as a child process? how does the c# process communicates with nodejs? and how does instructions eventually land in the browser?
4. When using solutions like lambdatest (example: https://www.lambdatest.com/support/docs/playwright-testing/#run-your-first-test) what am I connecting to in this case? the browser directly? or a playwright server?

thank you. 🙏