Difficulty level: Easy.
Computer or laptop
The easiest way. Go to the page with the video you are interested in. Copy her address. And paste in the special line that is located at the top of the main page of the site www.videosaver.ru. To the right of the line, you can select the format of the resulting file and its quality. Disadvantages: Downloading in FLV format leads to loss of quality, moreover, not every player supports it. To play FLV format, I would advise you to use the VLC program. When downloaded in MP4 format, the video is quite large in size. Advantages: user-friendly interface, the ability to download not only from YouTube, but also from many other resources.
Now let's move on to special programs. The best option is YouTube Downloader. Not only can it download videos from YouTube, but also convert for iPod, PSP (PlayStation Portable), Windows Media Player and several other programs. The interface is convenient: in the top line, enter the address of the page with the video, at the bottom, choose which device or program to convert the video to.