> List MOOCs, certificates, or free online courses on your resume. 99% of these require no commitment and don't teach you anything. Listing them signals that you care about cheap credentials more than learning.
How I can tell you don't work with the government....
Government and government-related consulting loves certifications. If you're in that field you probably already know this, but if for some reason you're looking to relocate to a gov't-heavy area, or just applying to a contractor for the first time: yes, list certifications if you have them. If you don't have something the employer will have to pay for you to get one anyway, so already having something will save them money.