This is supper easy.
This is all you need
first cut the paper to a decent size strip of card
cut it to a decent lengh
Fold the strap of cards into triangles and folding triangle in triangle
Then when you reach the end cut the end paper into a triangle
then where the gap on the big triangle is feed the small triangle in there
put presure on the middle down
Fold the sides and there you go.
Try it with card paper or even notes