Film editing has come a long way since its beginnings. Editors used to spend many long hours cutting film with razors and splicing sections together using tape or glue.
Nowadays, most editors use Non-Linear Editors. These are computer programs that allow users to cut, splice and re-cut movies quickly and easily.
A professional NLE can cost more than $1,000! But don't worry; with a good editor's eye and one of these free NLEs, you can make professional-quality videos using your own computer.
YouTube Editor - If you're looking just to make videos to post on YouTube, you can use the simple editor provided by the site. You'll be able to cut clips from any video you've uploaded and rearrange them into a single video.
It's incredibly easy to use, but you'll still be able to add cool transitions and titles. There are also dozens of one-click enhancements like stabilization, color correction and filters.
Windows Live Movie Maker - Windows Movie Maker has been around for a while. You may have even used it way back on Windows ME. It's made significant strides since its humble beginnings, and is actually a very serviceable NLE.