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Find the screen resolution of your monitor:
$ xdpyinfo | grep 'dimensions:'
Video connector type
VGA ports are old technology. Avoid if possible.
If your graphic card and your monitor use different types of ports, usually there is a possibility to buy a cheap adaptor, but not always.
If your monitor is VGA, you can find an adaptor to DVI-I or DVI-A to VGA, but not from DVI-D to VGA.