LCD stands for Liquid Crystal Display. When we talk about an LCD monitor, we are actually talking about liquid crystal displays.
TFT refers to a specific LCD technology and means Thin Film Transistor.
Almost all LCD monitors and LCD televisions are now based on TFT technology. Therefore, the different designation is not really relevant when buying.
The use of LEDs saves electricity and enables thinner displays. LEDs illuminate the screen from behind, and this technology is gaining the upper hand more and more. If this trend continues to develop, which is very likely, there should no longer be any difference in significance between LCD monitors and LED monitors.
However, many LCD monitors are still available with conventional fluorescent backlight.