[TimeZone]

Now, I'm already learning more about fabulous skin. My question is, watching videos on youtube aeon tajo, I can't see information about any artist

To get artist information and artwork, you must add the music into your library first. Music/video playing directly from YouTube is not in your library and you can't get artist info or any other info and artwork as a result. In fact, Kodi does not even know if are playing music on YouTube or if you're just watching a cats video . It does not know who the artist is or what kind of video is playing.

If you add videos (music videos) to your library, then it will ask for information online and it will know the artist, the vocalists, who was playing the drums, the guitar, the date the video was released\performed live, where did the artist perform this concert etc.

Have a look at the wiki here