I want to start with ASM to learn how a computer works and to learn other languages more easily. What are the best books for a complete beginner who want to "master" assembly (maybe not that much but you get the idea) and how a computer works ? I won't use ASM professionally so any ASM language should be fine (except if it uses AT&T syntax).

Ps : I know it's a bit overkill and it won't help me find a job.