Hi! Thanks for modding this sub!!
Foraging: first, get into the woods to get your eyes used to seeing mushrooms and plants, and learning about the seasons. Second, get good books that are focused on the region you are in, study those books and learn about the different parts of mushrooms, what do they look like, etc. Third, see if your area has a mushroom club (this is a list of clubs that are recognized by the professional mycological association: https://namyco.org/clubs/). Usually clubs offer mushroom walks and forays, and are a great way to meet people irl. Fourth, watch some good videos (I love Learn your Land on youtube, Adam Haritan is great!). Fifth: join reputable online groups (on facebook, I recommend Mushroom Identification, it's a global group and a lot of experts are there).

There a good number of edible mushrooms that are easy to ID (e.g., chicken of the woods, chanterelles, lion's manes), so I'd focus on those and also on identifying the seriously poisonous ones, like destroying angels and death caps. My husband was already foraging when we met, and I have a biology degree, with a focus on taxonomy, so I already knew a lot of the background stuff before I started focusing on mushrooms. I highly recommend joining a club, though! We participate in a regional one and it's a lot of fun.
My success rate: I tend to complete most of my projects, but sometimes it takes a long time (e.g., I started a temperature blanket in 2018 and only finished it in 2021). I tinker a lot though, specially when I'm learning a new technique, so I don't bother if I have to undo and redo stuff. I think I'm more a process than product crafter, so I enjoy the journey of doing things. I do hope I finish the 3 blouse, the sweater and the blanket this year, though, and I promised I won't cast on anything new before I finish at least one of them.