If you live in the southeast region of USA, Matthew Hunter is someone you should know about.
Legacy Wilderness Academy is where you can find him. He has a significant amount of free stuff.
From his about page:
Legacy Wilderness Academy's mission is to teach Southerners how to harvest clean food and natural medicine from the wild plants that surround them every day!
His YouTube channel.
In his herbal videos, he tells you about a given plant or tree. He shows you on location how to identity it. He also showes how to harvest each usable part and how to process them in your kitchen into medicines. Tea, decoction, or tincture as applicable. He also shares what dosage he uses.
Here is a sample video.