Question

What are the different types of nebulae?

Answer 1

Bright Diffuse Nebula, Planetary Nebula, and Supernova Remnant

Explanation:

Bright diffuse Nebula are areas of hydrogen gas where new stars are formed.
i.e. Great Orion Nebula

http://www.feraphotography.com/AM14/M42.html

The other two are connected to the dying stage of a star:
Planetary Nebula are the shells of gas that were thrown from red giant stars.
i.e. Cat's Eye Nebula

http://pics-about-space.com/cat-s-eye-nebula-hd?p=1

Supernova Remnant are those leftover from a massive stars' explosion.
i.e. Crab Nebula

http://earthspacecircle.blogspot.com/p/crab-nebula.html