How to properly set up YAMLMerge and a merge tool on windows

Is there a proper and thorough guide on how to set up YAML merge on windows?

I tried to follow this: https://stackoverflow.com/a/45738772/4279201

but Meld is always showing this:

And I also got these many zero files as conflicts on each small change (do I even need them?) and the only way to "resolve" them is to launch the external merge tool (which I don't think work).

So is there a proper guide on how to set this up?