You can assign points the product in three ways.

1. Global Point Assign (Assign Points to all Product)

2. Per Category Point Assign ( Assign points to the different category )

3. Per Product Assign Points (Individually Assign Points )

For Globally assign points to visit WooCommerce > Assign Product Points Here you find "Global Product Points". Now enable the setting and assign points to all product in a single click.

For Category assign points, below the "Global Product Points" setting you will find an option to assign points per category.

For Per product assign point, visit particular product edit page. In Product data section you will find a tab "Points and Rewards" click on that tab after that Enable Points Per Product and Enter the points. Now, update the product and Product points will get display on Product Page.