Vastu Shastra is a traditional Hindu system of design based on directional alignments. It is primarily applied in Hindu architecture, especially for Hindu temples, although it covers other applications, including poetry, dance, sculpture, etc.

Vastu broadly can be classified into two Categories namely

1. Exterior vastu
2. & Interior Vastu

Exterior vastu
This decised the direction and position of the specific room on the proposed site.
For Example (position of Puja : It should be in the north east direction )

Interior vastu
This decides the direction in which should place the statue of the lord.

& The most important is the 2 sub-divison of these two basic categories are

1. what to be done
2. and what not to be done (more important)