Welcome to permies. I use iNaturalist all the time out in the pasture. I put your green plant in it, the first one up at the top of your page, and it thinks it is in the aster family. It didn't like the purple picture, there's too much other plant matter in with it. That being said, I take five or six photos of the different parts of any plant that I find - backside of leaves in close up, plant in its habitat, fronts of flowers, backs of flowers, stems, leaf nodules. There's a button right below the photo you upload that says something like what did you find, if you click on that it will give you suggestions. I usually accept the suggestion that looks right and post it to my observations page. Then, other people can weigh in on what they believe it to be. So, not necessarily an instant process, but an interactive one. I've had people from Europe weigh in on some of my observations of plants that they specialize in. I recommend it. Can't remember if you said you were in Eastern Oklahoma, but probably some plant identification walks or classes there. There is Facebook group called central Oklahoma permaculture I think, and lots of other plant groups that could help you find a class. Unless it's a pretty strict plant group I wouldn't recommend any Facebook group for identifications as people will tell you what they guess it is whether they know or not. Oklahoma also has bioblitz at least twice a year,spring and fall, where people teach many classes or will take you out on a nature walk for anything from lichens to snakes.
Good luck and have fun.