You want a heading in a rounded-corner rectangle, but you don’t want them in a separate frame. Can do!
It’s not hard to make custom underlines, but what if you want them to extend to the edge of the frame?
Here’s a trick from Diane Burns that lets you make a text frame expand (or shrink) horizontally, depending on how much text you put in it.
Need to draw a vertical bar along the left side of some text? Here are three techniques you should try!