File → New → Width 200 → Height 200 → Select Pixel → OK.
(2) Fill the canvas with a blue gradient.
(Canvas gradient I can't)
Draw a rectangle of 200*200 with the rectangle tool (size: click on the rectangle you drew, with width and height in the lower left corner) → click on the rectangle → click on "solid" below → select "gradient" → "linear" (the position can be adjusted by yourself).
(3) Create a new circle with the diameter of 120px in the center of the canvas.
Draw a perfect circle of 120px in the rectangle tool → click on the perfect circle → click on the entity below → select gradient → radial (adjust the position by yourself).