Ditto to Cunningham!
I’m still learning but have a few sources I use a lot, including the Cunningham book.
I also like A Master Grimoire of Oils, Herbs, and Incenses by Pat Kirven Sawyer and witchipedia.com
I’m also reading this currently- Herbal Magic Correspondences Guide by Briana Blair and working on integrating it into my plant info spreadsheet here which I hope can also be helpful (it is based on Cunningham’s and Sawyer’s books). I update it whenever I can
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