First, Sony Vegas is much easier to learn for beginners than, for example, the same Adobe Premiere Pro, which is designed mainly for professional work and earnings (although in Sony Vegas people make good money).
Next, it should be noted that Sony Vegas has a fairly flexible interface configuration. You can customize it, which is called "for themselves" (I, for example, almost never work with the window trimmer, so just remove it, thereby expanding the space within the program). Although the interface of Vegas itself is already well thought out.
Sony Vegas allows you to work with an unlimited number of audio and video tracks.
Works with a large number of video formats.
Easy to work with sound: allows you to easily separate, delete, replace audio files, as well as mix them and change the volume levels.
Supports 5.1 surround sound.
It is also noteworthy that Vegas is able to record audio directly and you may not need a separate recording program.
In addition to the ability to download ready-made files, it has the ability to capture video.
Supports very high resolution video and images.
Easily accomplished acceleration and deceleration of the video.
It has ample opportunities to use a huge number of transitions and effects.
Vegas is easy to work with text: it allows you to create titles for videos, watermarks.
Able to output (save) the final video in various formats and in high quality.
And, importantly, it makes it possible to save the video without squeezing and loss of quality. Only in this case you need to remember that this video will be quite a long time to calculate and large in size. But in some cases, you need this option to save.