There are many different bindings that fall under the category of long-stitch, but most are distinguishable by long stitches that attach gatherings of folded pages (also called signatures)
Bookbinding Fundamentals: Long-Stitch Leather Journal, Envato Tuts+
BOOKBINDING, Long Stitch Variation - perfect for diaries, sketchbooks etc., Corliss Bookbinding - Stefanie
Make your own leather journal with our complete DIY kit! This kit includes everything you will need to bind your own long-stitch journal, plus you can
Leather Journal DIY Craft Kit Long-Stitch Binding
DIY Long Stitch Bookbinding Tutorial
Ganesh Karri
Long-stitch bookbinding simple bookbinding (no music, no talking)
long stitch bullet journal — paperiaarre
How I bind my notebooks using glue and paper tape for 0.25€ : r/Frugal
85 Mother's Day Crafts Crafts & DIY Tutorials
Bookbinding Fundamentals: Long-Stitch Leather Journal