App/Service which sends out info-bites

An average users consumes content in various forms throughout the day. This content might relate to work, personal life or health.

You might want to incorporate certain habits or certain thoughts but you forget. Until you come across it again or you are reminded it because of some trigger.

Is there an app/service where one could make notes/short info, quotable quotes (but only for yourself) and set a schedule of when a particular quote is supposed to be sent back to you as a notification?

Different info could be sent out on different frequencies. Is there something out there, something simple?

Maybe a slack bot?