Evernote. Although a lot more than a bookmarking tool, once you fit it into your workflow, it is a pretty amazing tool for curating all kinds of things, and you can easily share it across all your devices. I couldn't live without it now.
If it's a good tutorial, etc, I copy the relevant part of the page, and paste into a new note. It keeps the formatting well enough, and on Desktop it picks up the Heading and Link on it's own.
A lot of times it will be a web design, or some other smaller UI feature that I like, and will screen clip the design and us Evernote as kind of a visual bookmarks.
Evernote is great for saving content, retaining its format if you want it and making it searchable, including text in graphics. In addition, you'll still have the content if the webpage or site disappears. It saves the source URL as an added bonus.