Of course. I have done most of my learning via books and trial and error. The first book I got was The Healing Garden which is written by an herbalists who does an online classes which I haven't done except the free ones. The book is beautiful and totally worth owning and will go over everything from organic herbal hardening, wildcrafting best practices, creating medicines and species highlights. Most books have the same categories as well.

I also recommend anything and everything by Rosemary Gladstar. She is a giant in the field and has lots of small densely packed books. I have her Medicinal Herbs and Herbal Healing for me both of which are great. Her herbal healing for men is the only men specific herbalism book I've seen.

If you need to buy herbs see if you have a local shop. They are usually listed as metaphysical stores which contains Tarot decks, crystals etc. some are good for herbs and some are bad. You will have to check them out yourself. Online Mountain Rose Herbs is amazing. Be careful elsewhere because some online shops are sketchy and are not giving you good herbs or worst of all something completely different. The best is growing it yourself or buying high quality culinary herbs. (A lot of culinary herbs have medicinal qualities usually at higher doses but can still be part of a dish).

All the books have more resources and there's tons of ways to go. All the books are modern Western herbalists which combine multiple historical traditions which is typical. But you can deep dive into specific traditions as well (Chinese medicine, ayurvedic, traditional European herbs, indigenous etc.). Follow the references.

The only watch out I will give you is this. A herbalist should never use only essential oils for treatments. That is a scam and usually a MLM. Full plants are preferred and essential oils are usually just used for smells. Second, they should be a supplement to standard Western medicine and not a replacement. It covers gaps within that system (chronic issues, preventative medicine, quality of life, etc.) and should still be used. Most herbalists think of that as hero medicine for the big things while herbs do the rest.

Have fun!!!!