How to import old posts from another system into my wordpress blog?

I have an old log through B2Evolution (https://greatestultimate.com/) that I want to finally port over to my new WordPress blog (https://greatestultimate.com/wordpress/). Ideally, I would take the hours to pour over my entries and decide what I want to keep and what not to keep. Categories have changed.. my focus and attention has shifted. blah blah blah.

The question here is how to export from b2E and into WordPress? Anyone have a step by step? And ideally, I should run a back up on the current wordpress database.. how to?

Please advise,
Brett