I remember this question was actually helpful, but search results are a bit outdated, it would be nice to have some new responses.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.
Mind exposing what this is and what it’s used for?
You can perform weddings!
There’s the Universal Life Church, the Church of the Flying Spaghetti Monster, the American Marriage Ministries, and I have no idea how many others.
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
I don’t think anyone has ever regretted having CPR training.
It might not be the most important thing to have on your CV, but you never know when you’ll need it and if you ever do it’ll be the most valuable thing in the world.