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Machine code and compilation into it - how is it?

How does compilation to machine code work and how does it work? How do I make a machine code program myself? For example, ho ... to work with this, because I've always dreamed of trying to build .exe on my own, without the help of ready-made compilers.

How are the processor's bit depth, the bit depth of its registers, the size of the addressable memory, and how does all this affect performance?

I study computer architecture from books Tannenbaum and Harris. I still don't understand many seemingly simple things. Ther ... it? The bit depth of the registers? And what is the difficulty of increasing the bit depth of registers? What determines it?