Hello Amitava, there are many Vaastu door guidelines if it is main entrance. But here are some details that may help you. The main door as per Vaastu is where all energy enters homes and this includes all good luck and happy, positive energy. Vaastu experts say that main door should be in north-east, north, west since these directions are auspicious. Do not keep main door in south-west, south or north-west. Even south-east is avoidable. If door is there in south or south-west direction, use lead metal pyramid for correcting the flaw. Connect north-west door with brass pyramid and helix and south-east door, if there, should get a copper helix.
Of course, main door should be the biggest door in your home and should open in the clockwise format. Do not have three doors in a single line which are parallel to the main entrance since this is a defect in Vaastu and may affect overall happiness levels. Wood is the best material for your main door. For south direction, door should also have some metal with wood. Same for west and northern door may have silver based color. East door should have wood with limited metal embellishment. Keep the main door area well decorated also.