The number of cloves of garlic you should use for one portion of pasta sauce depends on personal preference and taste. Garlic can vary in intensity, so the amount used can be adjusted to suit individual tastes. As a general guideline, for one portion of pasta sauce, you can start with 1-2 cloves of garlic.
Keep in mind that some people love the strong flavor of garlic and may opt for more cloves, while others prefer a milder taste and may use less. If you're unsure or cooking for someone else, it's best to start with a smaller amount of garlic and gradually add more if needed after tasting the sauce. This way, you can ensure the garlic flavor is to your liking without overwhelming the dish.