I remember this question was actually helpful, but search results are a bit outdated, it would be nice to have some new responses.
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Being a religious officiant is an easy credential. In the US at least.
free but you can pay for certs for a bunch of them too: https://ocw.mit.edu/ https://www.businessinsider.com/guides/learning/free-mit-online-computer-science-classes
Depends on your area if it’s free but you can never go wrong with CPR/First Aid
