There’s some useful advice here:
https://forum.inaturalist.org/t/taxonomy-for-dummies/37134
Beyond that, I’d say that if you have a particular place that interests you, go out and buy a local field guide - they generally explain the basics of taxonomy along with how to ID local species. Beyond that, try to find local natural history groups that have field trips, such as a native plant society, and go on field trips and ask questions - most people who organize field trips love to share their knowledge.
Most of all, have fun learning, and take a break when you get frustrated.