"How can I make a one-sided arrow?"

This is a pretty common question, and there are a few ways to do this. 

First, in the Shape Tools drop down menu, there's an arrow tool (Shift+L is the shortcut). 

Or, you can also do this:

  1. Use the pen tool (or the line tool; "L" is the shortcut) to draw a line on the canvas
  2. Select the vertex you want to change
  3. Select the three dot menu underneath Stroke in the Properties Panel to open the Advanced Stroke menu
  4. Choose Line Arrow or Triangle Arrow from the Cap dropdown 

On a related note, if you're wondering how to round the corners of a rectangle, head over here

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