Answer 1

Check out assembly language programs. My first language was IBM 360 assembler and I recall using it. That was a more than 45 years ago and if my memory serves me right, I used it for effeciency.

Answer 2

What you mean about 0s and 1s? You mean all about bitwise operations or what?
Anyway, i think than the tutorial is good writed and, if you see the title, its called "Intro to..."

Answer 3

A fast search with master Google and i finded, between others, this https://code.tutsplus.com/articles/understanding-bitwise-operators--active-11301

Answer 4

Check out assembly language programs. My first language was IBM 360 assembler and I recall using it. That was a more than 45 years ago and if my memory serves me right, I used it for effeciency.