@alexandra @Jaqueek Subpixel antialiasing and font hinting can have its own book (books?) too. To do that, TrueType uses a virtual machine and embeds bytecode in fonts.
This is the instruction set of the TrueType machine. https://developer.apple.com/fonts/TrueType-Reference-Manual/RM05/Chap5.html
"What is your favorite CPU architecture?"
"TrueType."