Messing with Corners - Illustrator

Making A Bunch of Curved Points

After creating a series of lines, you can select the entire segment, and go up to the top menu bar. Look for where it says 'Convert:'. The two icons next to it will convert selected anchor points in different ways. The one shown above makes them into curved anchor points.

Another way to work is to click on the round corner widgets and dragging them with the White Arrow Tool selected. You can select as many of the points as you want to use this effect on.