I have no idea what to code?

Answer 1

depends on your skills and interests.
start with a code that suggests projects based on the user's input parameters.

Answer 2

It seems that you like expensive cars! Make an array of images of performance cars then as the user selects details it should only show cars that match the details. You can use checkboxes to select the details. You can choose from country of origin, price range, race cars…

Answer 3

Make a Simple tic-tac-toe Game