NASM assembler - How to make sure the function label isn't executed one extra time?

Question

Hello I am tinkering around with assembly level programming. I have the following code

    mov al, \'H\'
    call my_function

my_function:
    mov ah,0x0e          


        

Answer 1

As Jester notified in his comment, all the labels which are supposed to be functions must be below jmp $ statement so it doesn't execute an extra time.
P.S. jmp $ is instructing the system to jump to the current location which results in an infinite loop, not allowing to proceed further where the functions exist.