In order to trigger an action to be executed at a specific time and to make this action recurring, what should I do?
That depends on what app is being used to trigger the automation, and depends on what actions are trying to be executed after the automation is triggered.
The tech term is cron, which is a utility program that lets users input commands for scheduling tasks repeatedly at a specific time. Tasks scheduled in cron are called cron jobs.
For example, Zapier has a Schedule app that can be used to trigger Zaps: