Looking for something that actually shows you how to use the knots, not just tie them, right? Most knot books lean way too decorative or way too utilitarian. A classic that bridges the gap is Ashley's 'The Ashley Book of Knots'—it's a monster of a reference, but you have to sift through it. The illustrations are old-school and fantastic for learning, and it's got everything from basic hitches to fancy decorative work. The big downside is it's not the clearest step-by-step; you'll need some patience. For a more modern take, 'The Ultimate Book of Everyday Knots' by Geoffrey Budworth is surprisingly good for both. It's got clear photos for practical stuff like camping and boating, but also dedicates sections to decorative knots like Turks heads and Chinese button knots. It's not the deepest dive into either world, but as a combined starter, it's solid. I found the decorative sections a bit brief, though—ended up supplementing with YouTube for the celtic knotwork I wanted to learn.
If you're into maritime stuff, 'The Marlinspike Sailor' is a hidden gem. It's mostly practical sailor's knots, but the way it presents them—with instructions for making useful gadgets like a rope mat or a doorstop—feels crafty and decorative in its own right. The presentation elevates the practical into something you'd want to show off. Honestly, the best combo might be two books: one purely practical manual for your needs and a separate one focused on ornamental knotting like 'The Complete Book of Decorative Knots' by Lindsey Philpott. That's what I wound up doing.