Estimation. If you get into the habit of doing a back-of-the-envelope approximation any time someone mentions a figure, you can develop the fine ability to tell whether they have any idea of what they are talking about. Alternatively, you can get a clue about just how big/expensive/difficult a project is.

Basic statistics and probability. You hardly ever need to pull out a T-test or calculate the standard deviation, but knowing what they are and why you should expect runs of good luck and bad can help smooth out your life.

Sitting down and concentrating on a subject may not be a teachable skill, but it can be learned and practiced. Highly recommended. Similarly, general research skills are lifesavers. Most people think they have them. Most of those people are wrong. Again, there might not be formal classes (or there might be, if you have a Library Sciences department) but they can be learned.