HitFilm Express is a powerful, free video editor and visual effects compositor. Having used it for a few projects, I found that it is a very good video editor able to create some nice effects.
From the name itself, you know that HitFilm is tailored towards film making. A lot of tutorials on the software itself teaches things like creating various type of effects in film like blaster effects, iron man suit, etc.
There is a paid Pro version, which is full featured.
I used the free version and find that it is more than adequate for the videos I currently make. Off course, if you want more control or use more effects for example light sabers, gun shots etc, you can purchase individual packs or go for the Pro version.
If you are looking for a quick guide, check out the HitFilm Express for beginner tutorial on this page.