I'm a little sad about this. My dad works in computer storage and had access to lots of computers doing nothing. He's now at "just about 11 quintillion flops, 99.12% ranking vs all other users"
It clicked a bit more for me understanding the box model better.
More recently flexbox makes things a lot more clear/easier and handles a lot of those problems by default.
I have no idea how design works, that seems a bit more art.