# use # for comment your code

mov = MOVE register value/value to another register : mov eax, ebx == eax = ebxw
add  = ADD to register a value : add eax, 9 == eax += 9
sub = SUB to register a value : sub eax, 9 == eax -= 9
inc = INCREMENT register : inc eax == eax++/eax += 1
dec = DECREMENT register : dec eax == eax--/eax -+ 1
xor = CLEAR register : xor eax == eax = 0/eax = NULL

Now, we can manipulate numbers into registers !

mov eax, 10 # we can move also numbers
mov ebx, eax
add ebx, 10 # ebx = 20
dec ebx # ebx = 19
xor ebx # ebx = 0/null