What courses count as free elective courses

What courses count as free elective courses, or are any classes with credit count of a free elective? Is there anywhere that I can find free electives?
Any class that is not required for you to take afaik. This usually applies to all classes but there may be some exceptions. For example, if you are a Econ major and you take a random 3/4 credit Chem or Physics class, that should count as free elective. Effectively, in addition to that, you can also do research or TA for credits (or even do an internship) which gives you credits that can most likely go towards free electives.

Please talk to your advisor before enrolling in such courses so that you don’t make a mistake.