Q&A for How to Record Audio on a PC

No. You usually need a program that will enable you to do that. It's very simple. Install Audacity free audio program. Once the interface is open, there are several choices for the procedures you wish to use. Once set, you play your chosen music on your PC and start recording. The help files are really good and easy to follow.

No. This is about how to record sound (including speech) as an audio file. It is not about "speech recognition" to convert audio speech to text.

Yes, you can record internally using the first method in this article. you can play music from YouTube or your music player and record it with Audacity without catching any residual background noise.

You can, but first save the internal track. Then record the new track (singing) while playing the other track.