How to run CRON.PHP

[phileeny]

I don't know the programming language to get under the hood so all this "docker exec -i Nextcloud sudo -u root php -f" is lost on me but I'm learning, I figured -u is user.

I have searched the forum and the web but all I get is more confused.

I have nextcloud installed and running but I can't figure out CRON in nextcloud, it says CRON recommended

Use system cron service to call the cron.php file every 5 minutes. Recommended for all instances. The cron.php needs to be executed by the system user "www-data".

my nextcloud cron.php file is in location "/mnt/user/appdata/nextcloud/html/cron.php"

but how do I run the file?

I tried with User Scripts

#!/bin/bash
docker exec -i Nextcloud sudo -u root php -f /mnt/user/appdata/nextcloud/html/cron.php

but this did nothing

and I see crontab on websites, I did find it on terminal "crontab -e" but not sure what to type in and any thing I try I try is just a stab in the dark, I can't even get it to save or run.

Could someone please help.