That first and second look to be giant ragweed, AKA bloodweed. Yes, there are both leaf types, five and three. The pollen is a major allergen, but it's not much of a skin allergen, although it can happen. It is a very aggressive colonizer and a huge nuisance, as it grows very large and spreads like mad. Get on it now with Round-up or similar. It will kill it nicely when it's young. If you can kill it out the first year, you will probably have a light problem next year, but go after it heavy. It and pigweed are my major pests.
I see poison ivy and maybe poison oak and some other stuff that I don't recognize as poisonous. Maybe some Virginia creeper, which is no problem.
Poison ivy also responds to Round-up. You may not be fond of herbicides, but you're not going to make headway against giant ragweed without it, and not against poison ivy without getting intimate with it. Just use a hand sprayed and be a surgical as possible. If the giant ragweed gets out of hand, you'll be out there with a 15-gallon tank sprayer trying to knock it down. There's a lot of stuff on DIY natural things for poison ivy, but in my experience they all take time and commonly don't get the roots.
