Plenty of good answers here already. Just want to add a funny anecdote.

I’ve had the same USB charging brick for years, using it for different phones throughout that time. When I check the battery settings when it’s plugged in it “warns” me that I could be charging at a higher rate if I plug into a higher amperage charger. Yeah… I know. I WANT to charge slowly. It’s gonna be plugged in all night, what do I care?

I’ve had my phone for a year, 165 charging cycles, and it says it’s still at 100% health. I do cap charging to 80% and that hasn’t been an issue for my day-to-day usage.