As for a version that's "up to date and not buggy," I think the latest (10.16.4) is a good choice; there were a few bugs related to the big features added in 10.14.0, which have pretty much all been found and fixed by now. 10.18.0 is in testing and mostly adds forward compatibility with 11.0 features.
For someone starting with Chef, I believe the error handling added with 10.14 will be a huge help in finding mistakes from typos, etc.
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