What are some of the most simple database products to get started with?

I'm trying to start a new project and I see Theo often recoemnds cool new technologies that really simple to get started with. Most recently PostHog impressed me.

So I'm wondering what has he suggested for DBs? I'm looking for something REALLY simple to get started with and that I can start storing/reading from in just a couple of lines of code if possible, ideally with an online editor for the data.

Thanks.
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