Refinement

In the scrum guide you can find the following: Product Backlog refinement is the act of adding detail, estimates, and order to items in the Product Backlog. This is an ongoing process in which the Product Owner and the Development Team collaborate on the details of Product Backlog items. However, Product Backlog items can be updated at any time by the Product Owner or at the Product Owner’s discretion."

Some people say only professionals should add estimates. See https://www.linkedin.com/feed/update/urn:li:activity:6355318433369980928.