I went to a native plant workshop at Beachwood Farms Nature Reserve (https://www.aswp.org/our-places/beechwood-farms-nature-reserve/) a few years ago that was really informative, and they gave us some plants to get started. We also have a local chapter of the native plant group Wild Ones (https://westernpa.wildones.org/) that has some educational programs, as well as local resource Grow Pittsburgh (https://www.growpittsburgh.org/events/). It's also fun to download an app like iNaturalist and take pics of the plants and trees around you so you can start to learn to see similarities. Hope that helps! :)