に越したことはない

に越したことはない is used when you want to emphasize that there is no better option or precaution than doing a certain action. It often conveys strong common-sense advice or a prudent choice, and it can carry a slightly formal or earnest tone. The phrase attaches to a verb in the dictionary form (Vる) or to a noun, indicating that choosing this action is the best or safest course, sometimes used to downplay alternatives. It is not meant for casual, everyday minor tips, but rather for sensible, generally accepted advice or preparation.