I don’t have formal botanical training either, so a lot of my knowledge of the broader taxonomy is based on bits and pieces I’ve gradually picked up or intuited. IDing is also good for expanding your knowledge – I certainly know a lot more than I did six months ago. The taxonomy tab on iNat taxon pages is also helpful for getting a sense of how the different plant groups relate to one another.
I thought there was a discussion sometime in the last several months by other users who are also trying to get a grasp on general plant taxonomy, but I can’t find it. This thread might be of interest, however:
https://forum.inaturalist.org/t/questions-for-the-botanists/38906