What's the meaning of idiom 'one less thing'?

Question

What's the meaning of "one less thing" in the following sentence.

That's one less thing you'll have to think about in launching a business.

Thanks in advance.

Answer 1

When you launch a business you have to think about many things—a long list of things.

Every time you encounter a new problem, you add it to the list. The list is longer by one, and you have one thing more or one more thing to think about. And

Each time you are able to cross something off that list, the list grows shorter by one. That’s one thing less or one less thing you have to think about.

Answer 2

I think it means: That you have lots of things to think about in launching a business; and this is one of those many things that you don't have to think about. *PS---(I am not a teacher nor an expert, so don't really count on that answer).

Answer 3

That's one less thing you'll have to think about in launching a business.

Means:

You don't have to think about that thing when launching a business. It's probably already done, or something not to be done at all, so you don't have to think about it anymore.