I do not know how to get Siri to start a list for me or to remind me of something

I do not know how to get Siri to start a list for me or to remind me of something. The hey Siri feature tells me I wish I could help but not fully has not set that up with me yet. I know I have friends who use Siri with a reminder app and it’s easy to set reminders and start list. But I’m having trouble.

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