Take a sheet of paper.

Fold it in half one way.

Open it up and the fold it in half the other way.

Open it up and fold the bottom up to the middle fold, long ways.

In the same way, fold the top down to the middle fold, long ways.

Open it up and fold it in half, short ways.

Cut a slit from above the bottom fold to below the top fold.

Open it back out.

Hold it up and push the two edges together so that the slit opens up.

Fold the edges to secure the shape.

Lay it flat and fold. You have now made a cute little book.