Seconding @plebpoet's suggestion about getting lost in a bookstore or library (not to mention reading her work); fate and chance are fantastic for discovering poems, in my experience.
But also, poetry is an incredibly broad category. If you've got some poets or poems you already like, that's always a good starting point -- see what subgenre they're associated with, if they write in any particular form (sonnet, villanelle, etc) that appeals to you, etc.
If you're starting from scratch, finding a cheap used Norton Anthology of Poetry is great way to get a sense of the range of poetry over a long period of time. And the website of the Poetry Foundation has thousands of poems, as well as some analysis of a lot of the work.
oh my god I did not realize we had a Norton man among us. These are great suggestions. Actually I just remembered I have an email subscription from poetry foundation, they send me a poem-a-day, so that's a great way to get exposed!
There's books that are collections of poems from several authors, you could look for them. I'd recommend starting with classics and then find out what pleases you most.
The list bellow is also a good starting point, in my opinion. Don't feel bad if you don't get them or find some poems boring, just take note of the authors you like and read more stuff from them.
https://stacker.news/items/579738
#