Often a sole proprietor means someone who operates a business but reports the income on their individual taxes and doesn’t have a separate legal entity. LLCs are a legal entity that can provide personal liability protection, even if still owned by a single person. In other words, it can protect the owner’s personal assets from certain business debts or liabilities. Sole proprietors and single member LLCs are taxed in the same way, unless another tax structure (like an S Corp) is elected.
Check out this article to learn more about how a sole proprietor is taxed.
Check out this article to learn how an LLC is taxed.