Doubt if my Assembly code is right

Question

Good evening, I’m starting to study Assembly and I have doubts about the exercise I’m solving. The first I’m trying to create a section of uninitialized variables, and the initialized ones and make the following copies n1 = v1 N2 = v2 N3 = v3 made this code, I would like to see if it is really right what I did or if it has possible improvements, use some other register

section .data
    v1: db 10d 
    v2: dd -20d
    v3: dq -30d

section .bss
    n1: resb 1
    n2: resw 2
    n3: resd 4

  section .text
  global _start

  _start:
mov al   , [v1]
mov [n1] , al
mov ebx  , [v2] 
mov [n2] , ebx
mov al   , [v3] 
mov [n3] , al

fim:
mov rax, 1
mov rbx, 0
int 0x80