How do you schedule tasks periodically?

You can use the commands cron and at. With cron, tasks are scheduled using the following format:

*/30 * * * * bash myscript.sh Executes the script every 30 minutes.

The tasks are stored in a cron file, you can write in it using crontab -e

Alternatively if you are using a distro with systemd it's recommended to use systemd timers.