I publish on my own site, here, and some articles on Medium and CodeMentor.
My own site is most important since it helps build my brand. It took a long time to gain any sort of traffic though. The canonical_url feature of dev.to made it easy to cross-post here.
I don't post everything to Medium since it has poor source code support. I only import articles with little to no code.
I also cross-post a bit from Quora to here, but only for extended answers, or ones involving extended thought.
I used to cross-post to CodeProject, but their import tool broke at some point.
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