I read something about a time delayed transaction or whatever, so the recipient can use the btc after a set period of time. But I didn't really understand it and maybe that's still not what I am looking for.
There is nothing hard in time locking, you should give a try to this topic made by LoyceV:
But please change the timespan, don't just lock your BTC for years that you don't want to, as it is also scary because once they are locked, they can't be unlocked until they complete their time. Overall, to learn about Time delayed transactions you can read any article from google but you don't have to as once you will give it a try practically you will automatically understand how things work.
A tip, try a small amount to lock for a small period of time so you won't make any mistake that could cost you to wait way more than the required time.