How to code a shell script to run a program when the system login? [closed]

I have write a python program that display the radio frequency, how to code a shell script to run it when the system login?

Answer

you can see step by step on this link : https://embeddedday.com/projects/raspberry-pi/a-step-further/running-python-script-at-boot/

also here stackoverflow Link : Run Python script at startup in Ubuntu