Here are a few versions for you!
As kids we simply folded colorful paper in the accordion style!
Me too !!! I remember folding paper back and forth accordion style !
To make one similar to the fan in Betty's response, glue tongue depressors onto the ends of the folds in the paper. Using paper that is the correct weight to hold a permanent crease and a paper folding tool and will facilitate achieving crips lines. These come in a variety of sizes and points, a selection of which is shown below.
This may help you
Maybe this link will help: https://www.goodtoknow.co.uk/family/things-to-do/how-to-make-a-fan-289723