I will show you how to draw a hoverboard from Back to the Future.
Step 1: The Outline
First, you draw the outline of the hoverboard. Next, its border and the first couple of lines.
Step 2: Basic Lines
You draw the next couple of lines continuing up. Then, you add some more.
Step 3: Last Couple of Things Before Coloring
Draw the circles on, and in the lower one write "MATTEL" and in the other one write "THBF." Then in the top two thicker lines, write, "HOVER" then "BOARD." Add a bunch of tiny circles to the areas indicated above.
Step 4: Coloring and Shading
Color the very top left area, the very bottom right area, and the "hoverboard lines" yellow. The words "HOVER" and "BOARD" a light pink. Color the rest accordingly, or however you wish. Shade the top area to add some perspective (the board is curved). I outlined everything in pen for clarity, but that's totally optional.
Step 5: Finished!
This is what the finished product should look like.