Soups are really forgiving. You just need a stock pot. When I’d worry about a soup I was making, a chef friend of mine used to say, “it’s a soup- you could put your butt in it and it would turn out fine!” I wouldn’t take that as advice though.
Just buy stock/broth. Some benefits are:
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super nutritious
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very easy to make a lot to eat over time
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you don’t need to do a ton of fine knife work
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water limits your cooking temp to 100C, so it’s much harder to mess it up through overcooking/burning
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easy to start simple and add complexity as you level up. It’ll still be super tasty at every stage.