I learned how to determine which lines should be parallel or go to the vanishing point depending on a line's position in real life.
It helped my perspective of how to draw and it gave me an understanding of drawing 3D objects based on the object's position relative to my eyes.
I would probably make the windows smaller and put the table farther back since the apron of the window is too low to the ground if I had to do the assignment again.
I would tell someone who has never drawn first perspective that it is easy if you know when to use the vanishing point and when to make lines parallel to each other. Also, I would tell them to pay attention in class and know the definition of key words like parallel or orthogonal.
The slide show helped me the most because it showed me how to make the sizes accurate and what to do on some confusing parts like drawing the apron of the window and spacing objects.