Ask HN: Where can I find a primer on how computers boot?
Intel has opensource training on EFI/UEFI and the whole boot process. https://github.com/tianocore/tianocore.github.io/wiki/Traini... Alot of the other stuff is either outdated or not relevant for current stuff. Tianocore/EDK is pretty much the standard for dev on that level and this directly teaches that.