How do I make a pinned android notification which doesn't close, to remind me of sth?

Lets say I want to remember to prepare for something anytime. So I create a notification I would see it popping up whenever I would open my phone. or:

Let's say I want to remember to prepare for something anytime. So I create a notification I would see it popping up whenever I would open my phone.

or:Let's say I want to remember to prepare for something anytime. So I create a notification I would see it popping up whenever I would open my phone.

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