If you are interested in foraging for food, learning about how to do it safely and wanting to learn everything there is to know about foraging I recommend getting yourself some good books that you can take out and about with you.
I especially recommend getting ones with clear photographs so you are able to confidently identify the plants you are foraging before eating them or using them in herbal remedies.
Check out the Bookshop.org 'Foraging for food' list here.
Remember when it comes to foraging, safety is key.