I kind of believe in arm as its RISC based, i feel it's the future of CPU architecture. I'm betting my time and energy on this thing with this repository as a single place to learn everything there is about ARM
Some links and references are :
Arm architecture family : https://en.wikipedia.org/wiki/ARM_architecture_family
A curated list of all arm processors : https://en.wikipedia.org/wiki/List_of_ARM_processors
Introduction to arm assembly (Part 1) : https://azeria-labs.com/writing-arm-assembly-part-1/
https://forum.xda-developers.com/t/is-there-an-assembler-and-linker-included-in-android.4272371/