Step by step tutorial to change the shape of a circle with point in adobe illustrator

Step 1:

Go to rectangle tool -> ellipse tool

Step 2:

Select ellipse tool by single left click on mouse.

Step 3:

Press left mouse button one time and dont release it. move your mouse to draw the desired circle

Step 4:

Release the mouse button. Congratulations! now we can see circle on our document.

Step 5:

Select the direct selection tool and select the circle by single left click on any corner of circle.

Step 6:

Now, you can see the handles on circle. just move the handles to change the shape of circle.