Blueprint
Every part starts as a drawing: thin lines, no fill, a front view you can read at a glance.
Solid body
The same lines become a shaded body. Edges stay crisp so you can still read the drawing.
Exploded view
Parts separate along their axes so each one can be numbered, listed and inspected on its own.
Section cut
A cutting plane sweeps through the assembly and hatches the cut faces to show what is inside.