Sometimes all the register names can be confusing, but 90% of them are very simple once we understand their origin and how they all relate. I hope this helps! To skip the history lesson, jump to 02:20 Stack video with RBP/RSP registers: 00:00 Too many register names! 00:24 How Intel named the first registers 02:20 8-bit registers: A, B, C, D 03:35 16-bit registers: AX, BX, CX, DX 05:30 32-bit registers: EAX, EBX, ECX, EDX 06:30 64-bit registers: RAX, RBX, RCX, RDX 09:20 How 32-bit/64-bit registers interact