When I started using fountain pens, I quickly figured out that cursive actually makes sense with fountain pens. So I looked at a few guides, at first I didn’t really know what I was looking for and just experimented. I looked at a bunch of the classic U.S.[2], English [3], and German[4] cursives and kind of picked what I liked.

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[2] US cursives: https://loopsandtails.com/cursive/
[3] English round hand: https://www.google.com/books/edition/The_Universal_Penman_Etc/lHQdZONVcIkC
[4] German old teaching script: https://commons.wikimedia.org/wiki/File:Lateinische_Ausgangsschrift_1953_plain.svg#/media/Datei:Lateinische_Ausgangsschrift_1953_plain.svg