Should nav items be hover or click to activate dropdown?

When theres a dropdown option, should users expect to hover on it or click on it?

I have seen this done either way.

I recently visited this lightspeed's website. They have a dropdown menu for their Product page. I noticed me and other people are clicking on product while its suppose to be a hover. It will bounce me to the product page and I continue to click on the product page another time before I realize I'll need to hover over it for a second before selecting another option.

https://www.lightspeedhq.com/products/

Is there a standard in doing this (hover or click?). Or maybe lightspeed just has a slow ui transition?