Continued help with site.

I need help continuing to build my site.

For this I need to build a shopping cart.
The shopping cart must have the following:

Must be able to add a product to the cart

must be able to delete a product from the cart

need to be able to edit the quantity of a product from within the cart

Need to be have a “miniature shopping cart” that displays the number of products currently in the cart as well as the final price. (I already have the html and css part built in the header)

Must be well documented.

Thanks for the help!

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