This lesson is about writing a calculator in assembly and juggling the ascii representation of numbers. The big thing here was learning that the bl register is the lower 8 bits of the ebx register while bx is the lower 16 bits. I also learned about memory dereferencing with the square brackets and that the xor is a faster instruction that doing a mov of 0. Very cool.
The memory dereferencing is cool to see and I'm curious how it would work in something like utf8. Ascii is 8 bits and so the memory address math is straightforward because it is a single byte.
Assmebly namespaces are when you use the dot prefix. This way you can use have subroutine names repeat within a global subroutine. I imagine this is going to be very useful going forward.