need help about the conception of IoT , LXQT, LXDE

[4471...@qq.com]

Hello everybody:

         When i update my system of my BB-B board,i should download the .img file.But when i download the files,i don't konw the difference between  IoT , LXDE and LXQT.

         So what the difference about them. In addition, i want to use a LCD screen as a peripheral device,  what version of the .img file  should i download.

Thankyou!