GUI on boot

[Myles9]

I am new to boot systems and GUI's and I would like to know if it is possible to time a program perfectly and make a custom GUI in a Python 3 program launch over the desktop. Directions would be appreciated. Thanks!

[KLL]

you should start with making a .desktop file that starts your python on click
later can copy
cp /home/pi/Desktop/myautostart.desktop /home/pi/.config/autostart/myautostart.desktop
sudo reboot