Graphics memory on notebook?

I never play on full graphics settings so I want to know if 4GB of graphics memory is enough when I play on minimal?

Depends on the game and the graphics card

But yes, you can do something with 4GB VRAM.

Yes - 4GB dedicated VRAM is not a little. It is only important that you do not mean the normal working memory, because it is too slow. If your laptop has a graphics unit called "Intel HD Graphics", it won't work.