A Free program for Windows‚ by VideoLAN
VLC Player is perfectly safe. While there would ordinarily be a risk of download malicious software when looking for software on the Internet, this version of VLC Player is only available through the Microsoft Store. This means that it is vetted by Microsoft before being listed, so should be safe.
All versions of VLC Player, including for Windows 10, are open source. This means they are free to download and use with no restriction. Open source also means that the source code which makes the app is freely available to download and modify. In this manner, the app is kept updated.
Typically you would go to the VLC website, or a trusted file repository site like Softonic. This version is specifically designed for Windows 10, however. As such, you will find this app in the Microsoft Store. Simply open up the store and search for "VLC Player". Once found, simply click "Get".
Whether or not you should get this version is a judgement call. On one hand, VLC for Window 10 is designed specifically for the OS, giving a better user experience on that platform. On the other hand, Microsoft restrict many features of apps in the Microsoft Store, such as DVD playback.
Unfortunately, DVD and Blu ray playback is not supported in the Windows 10 release of VLC. This is a restriction placed on the developers by Microsoft, who also removed any kind of native DVD playback support from Windows itself. The desktop version of VLC can still be downloaded from their website.
One advantage to having the VLC app in the Microsoft Store is the ease with which you can install it. Rather than downloading, running, and going through the installation procedure manually, you simply find the VLC app in the Microsoft Store, click "Get", and wait. Installation will be handled automatically.
Using VLC for Windows 10 is much the same experience as using the regular desktop version of the app. Albeit with slightly less features. Digital media can be opened from within the app or dragged onto the app to play. Controls appear at the bottom of the app when watching video.
VLC Player is renowned for being able to play a wide range of file formats, a feature that may be useful if you regularly watch downloaded content. The Windows 10 version of VLC gives you the same ability to playback digital media, with the convenience and visuals of a Windows 10 app.
VLC is currently still supported across most platforms, including mobile devices like Android and iOS. The app is open source, and managed by the VideoLAN Organisation. VideoLAN do not charge a fee for their apps, however donations are encouraged in order to keep apps like VLC supported in the future.
The Windows 10 version of VLC player is exclusively for x64 architecture, meaning there is no 32 bit version available. It is still possible to find a 32 bit version of the regular VLC desktop app, however, but the Windows 10 is 64 bit only, and given the trend in computers, will probably stay that way.