i can not connect my Samsung tablet as a second screen for my computer.

[Tomaž15]

I can not connect wireless screens with my computer. 

[BeemerBiker]

Should  work if both systems support the same Wi-FI band

You can project your laptop to any Wi-Fi enabled system such as TV or Monitor with Wi-Fi adapter
Some TV are smart but others need a dongle such as ROKU or Microsoft.

This link here gives instructions on adding a laptop to desktop as a monitor or vice-versa using Wi-Fi
Android can also do this as shown here
Once you are projecting on the screen you can select 'mirror' or 'extend'

This will either duplicate the screen or give you a second display.
Note that Wi-Fi will lag. A USB2/3 adapter will also lag but not as bad as Wi-Fi.
You would not want to project a game to a larger monitor using Wi-Fi but it would work nicely for web browsing, Office apps or anything other than a first-person-shooter game.

If you get a USB adapter be sure to read the reviews. Do not get an adapter that mentions thunderbolt as that means your laptop needs to have a thunderbolt port.

Let me know what you find out.