How to figure out why the Raspberry pi works in terms of software and hardware?

Question

linux

Hello!
To be honest, it doesn’t matter to me what exactly, raspberry pi or some other microcomputer. I'm interested in understanding why this works? How it works? What happens when power is applied to the GPIO + 5v? What is loaded where, etc. ....
I understand that this is a complex software and hardware complex, but I have a base both in terms of programming and in terms of electronics / hardware. I want to put everything in its place in my head and collect and systematize knowledge about how a computer still works?
If I want to build my own microcomputer, where do I start? How can I combine several dozen electronic components with solder and code in order to see an invitation to the user in the terminal?
If someone is interested in these things, please share your experience, or at least sources.
Thank you!

Answer 1

Read on DiHalt.
easyelectronics.ru/category/nachinayushhim/page/4
easyelectronics.ru/author/di-halt/page/17
Several years ago he had very detailed articles for beginners in this blog.
Starting with Ohm's law and choosing a soldering iron model and ending with writing an operating system for microcontrollers.