Vegas
VEGAS, more commonly known by its former name Sony Vegas, is a non-linear video editor (NLE) by MAGIX. it is historically the most popular editor for both YTP and Tennis.
Usage
Vegas is relatively intuitive, made for getting started quickly.

Notable Versions
As of writing, there are 22 versions of Vegas. However, some are more important than others!
Sound Forge Vegas 1.0
This was the first version of Vegas (not including Betas). At this point, it was only an audio editor.
Sony Vegas 4.0
This was the first version of Vegas with 3D Source Alpha.
Sony Vegas 5.0
This version, along with 6.0, were very common in early tennis. It is still used nowadays to re-create "retro" styles of tennis.

Sony Vegas 6.0
This was the last version of Vegas to (officially) support Wax.
This version, along with 5.0, coincided with the advent of Tennis, so many players' first version was this one during this time. It remains one of the most popular to this day.
Sony Vegas 8.1
This was the first version to have 64-bit support.
Sony Vegas 9.0
This was the first version of Vegas to support MP4 files, the most commonly used modern file format.
Sony Vegas 10.0
This is the first version of Vegas to support OFX plugins. This is the first version of Vegas that basically supports all modern features to get started.
VEGAS 14.0
This was the first version by MAGIX, who purchased the product from Sony. It is often considered the best version of the program (citation needed) from a modern perspective.
VEGAS 21.0
This version introduced AI powered features.
VEGAS 22.0
The current, latest version of Vegas. Adds a few more AI effects.