Q:

Magento 2 :How to restrict add to cart quantity limit?

I want to set a restriction for add to cart 
e.g customer only able to add 1 qty for a single product at a time.
I just want to set a limit on qty so the customer is not able to add more than 1 qty at a time.

A:

Go to Magento Backend and edit any item. There is one link available below QTY field advanced inventory. Click on that option. There is one text field available for it.
Maximum Qty Allowed in Shopping Cart you can uncheck Use Config Settings and set QTY there.
Save that product. That's it.
Hope this will help you!

