Server Daemons
The Greeks considered daemons to be spirits that work in the background, so that’s why daemons are called daemons.
systemd
/etc/rc.local
is deprecated according to ChatGPT.
Graphical Applications
Using a desktop file in the autostart folder.
lxde?
If running a version with desktop GUI, put the desktop file for the program you want to auto-start in:
~/.config/autostart
Short-Run Programs that Run Regularly
Crontab (everything with crontab can be done with systemd, but easier with crontab.