You can read the whole thing here. The coolest thing I found is a “pro tip”…

First, highlight the text you want to send into Ulysses, but don’t share from the little pop-up menu that appears after you highlight the text. Instead, go to the main Safari Share button and share the whole page URL. That way the title, the URL link, and your selected text will all be populated into the Ulysses Share Sheet. If you share just from the selected text pop-up menu, then all you’ll get is the text.

I don’t keep my ideas in Ulysses like that so much, but it’s a really cool thing I didn’t know the Share button could do in Safari.