How to migrate the posts from an old custom legacy blog to a new WordPress website?

Old unanswered question, but found this via the googles (1st answer) that appears to have good info / links (might be useful to someone):

What is the required format for importing posts into WordPress?

Plus this one from the Codex, which has info on importing from all sorts of formats, including RSS and XML. https://codex.wordpress.org/Importing_Content

If your old blog can export to one of those formats (or you can write a custom exporter into those formats), those links could give you a start.

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