Recording Spotify, Youtube and Web sites music with AUDACITY

Hi there,
I’m kindly looking for somebody who’s going to teach me on how to record with audacity taking music from Spotify, Youtube and Web sites. I looked on line to find a good Audio Recorder but Audacity is probably one of the best. I read that before using audacity I have to install Sunflower or something else and because I’m not familiar with these things, I decided to ask help to somebody in this forum. I thank in advance for any support I might have. THANK YOU.

See this tutorial in the Audacity Manual: