Vastu Sastra is natural law on architecture. Ancient monuments and buildings are made according to Vastu Principle. Five elements of Vastu Shastra which are mutually related to four cardinal directions of compass are fire, air, earth, water, sky .

North – Lord of this direction is lord Kuber who is considered lord of prosperity and wealth. His blessing gives money and prosperous career. Element of this direction is water. If defected then it will affect career and money of male member of family. North East – Lord Shiva is the lord of this direction. He blesses the dwellers with all round prosperity in career, money, fame, wealth, relationship etc.
East –Lord of East direction is Indra dev. The element of this direction is water. Lord Indra bless the dwellers with social status, good health, education, good relationship specially with parents.
South-East – Lord of the direction is Agni dev. The element of this direction is fire. Lord Agni blesses the dweller with luxury, glamour, material gain etc.
South – Lord of this direction is yum. The element of this direction is earth. Yum blesses the dweller with longevity, health, stability and strength as well as improves relationships with family.
South-West –Lord of this direction is Narityadev. The element of this direction is earth. Lord of the direction blesses its dweller with stability, good relationship, strength and health.
West – Lord of the direction is Varun dev. The element of this direction is water. Varun dev blessed the dweller with spirituality, religion, money, career.
North West – Vayu dev is the lord of this direction. The element of this direction is air. Vayu dev blesses the dweller with opportunities and good husband- wife relationship.
Centre –It is called the Bramhasthan. The Lord is Lord Brahma. He controls all energy flow in the house. So, if it is defected then all energy gets disturbed.

Reference from Arvind Sud Tutorial : https://www.vastuplus.com/vastu-directions.html