Door is an important to see in vaastu science. Main door take care of at least 15 to 20% of vaastu. Let us focus on the Main door and discuss some points
Other than seeing the auspicious directions for the main door we must see that the main door should be bigger and beautiful than the other doors available in the house. There must be a difference in size and looks from other doors. It should be cleaned, should not be worn out. Main door is the face of the house or structure. Maa Lakshmi and good vastu energy when enters the house it likes beautiful doors. And we all know that we are evauled by our face first.
Beautify with symbol: Door should be beautified by the auspicious symbols like Symbol of Kalash with coconut on it, Maa Lakshmi’s Charan (Feet) pointing towards the house, Swasthik with ridhi sidhhi and shubh laabh written on both sides of it, Swastikh is symbolized as Ganesha, Riddhi and Sidhi are his two wives , Subh and Laabh are his two sons. Toran and Bhandanwar is a good ornament for the main door, it invites good luck and also wards off the bad energies.
Lighting a diya outside the door is good practice. This should be done at the sun set. This practice wards away the negative energy coming in. It works as a security against the evil forces.
Opening Direction: The main door should open inside towards the left. This opening lets the energy come in very freely. Doors opening towards the right or outside are not considered good.
Another point is when you open the main door make sure there is no other door in front of it this rule is applicable both inside and outside the door.
Size: The size of the main door is also a point, the ratio of length and breath should be in 1:2.
Some of the places the height is very low due to the height of the ceilings. In some of the places you that due to shortage of the space the width of the door is very less. This creates problems in opportunities and wealth flows.
Ventilator: If there is small opening above the door in form of the ventilator it is very auspicious.
Outside the main door: Now we need to check if the door has any vedh's out side (Sharp energy arrows). These vedh shools can be in many forms. Structures ending or situated on a T end of road are not auspicious. A big tree, a pole, a big wall or building in front of the door is also not good. Giving sharp lights is one of the remedies to correct the defects for shool.
Important tip: Also do check that is the door making noise which is irritating and bad to hear. Mind it these noises cut the good energies stop these noises.
Worse Direction: If we talk about the main door facings there is lot to say, every direction from the eight directions has its own good and bad effects according to its usage. But just to discuss the worst entry I would Southwest direction as the last main door facing. It gives lots of delays in our life. Problems in many of the areas of our life. The magnetic energy started from the Northeastern sides should get accumulated in the southwest corner by providing the door from the southeast it gets leaked.