To be a good designer first we need to know about how to read a diagram?

First Angle Projection 

Third angle Projection

How many angle of projections we have? Why we choose only 1st angle and 3rd angle?

I am taking a small model to show you all what is 1st angle and third angle projection

First Angle projection

Third Angle projection

 We  have 6 types of angle of projection in which 1st angle and 3rd angle of projections shows more features of the model thats why we choose this both angles in Designing.