Typically, something like this:

 

When at the top of page:

It could be something like this:

 

What I’d recommend is keeping at least row 1 sticky, and row 2 (and optionally row 3) semi-sticky. Read more about sticky headers.

 

Amazon’s header on mobile is great inspiration:

 

 

Note that it contains a link bar below the search box, which features some of their categories. Read more on link bars.

EXAMPLES