I use the app PictureThis (https://www.picturethisai.com/) and then supplement it by researching the online on various sites. I don't have any particular sites to offer offhand, as I'm still figuring everything out myself. Another thing I have considered is buying some books from local native plant societies and organizations. They publish books that contain pictures and information of regionally native plants. They also have plant sales every year, where they sell native plants that have been grown by themselves or by known third-parties.

In general, I have tried taking an additive approach. I have only removed plants that I knew for a fact, through the app and subsequent research, were non-native and particularly damaging.