We are friendly community! No gate keeping (swish movement or ban) or tell you "you should already knew, we don't do that here, the newbie's and questions" (went extra mile loool).
GMT stands for Greenwich Mean Time, a time standard established in 1884 during the International Meridian Conference. GMT is used to display multiple time zones in a watch. Expensive watches use to have this feature, but as the year pass by, you can find it more in watches, especially in micro-brands.
Micro-brands, are small watchmaking companies that most of the time are cheaper and have a Japanese/Chinese mechanisms on them. Its all manufactured, hence the microbrand watch formula. Instead of buying a rolex GMT, you can buy an affordable micro-brand GMT, with a way better design.(Please correct me If I'm wrong)