I use a software called Corel VideoStudeo Pro X4. It was the best that I could find for what I use it for, which is pretty much just making videos for the display. You can add text and edit the audio so you can get good sounding audio in the video without any background noises that are captured when you are recording the video. It takes some getting used to, I'm still learning it and trying to get used to which button does what, but so far I've had good results with it. I made my 4th of July videos with it.
If you want something that is really quick, I'd just use Windows Movie Maker (if you have a Windows computer). I used that with the last video I uploaded, which was a teaser video of my Halloween display this year. But it's easy to use, free, and it comes preinstalled on Windows computers.