@Manos_THOF 

The QoS categories are powered by TrendMicro so you can use the TrendMicro Safty Site Center to look up various URLs to see which category a site is.

For example, if you put YouTube it shows it as streaming.

@Tony I need more clarification on this answer. I just purchased this and also had similar questions.

Gaming - obvious

Streaming - does this include Skype / Zoom?

Surfing - general browsing

Chatting - what does this include?

As a family in a house - we have scenarios where adults are using Zoom for business and we need priority. Which setting provides that? I already set priority on the individual devices but I'd like to be able to set up the application priority.

This is not about URLs - does the Qos recognize apps/devices? For example if I set the Qos to gaming will it recognize my Xbox over my iphone? Or is the Qos only making decisions based upon website urls?

If I set it to streaming and I'm watching netflix on a app on my iphone and my roommate is playing xbox and my other roommate is watching youtube on chrome on their computer who has priority?

TP LINK should provide a list of apps/devices and how they are categories for these settings. This is extremely important.