YoutubeToWAV:
Open your browser and visit
Download and install the 4K Video Downloader software.
Open the YouTube website, find the video you want to convert and copy its video link.
Open 4K Video Downloader software, find the "Paste Link" button in the software interface and click it to paste the copied YouTube video link into it.
In the pop-up download option, select the audio format as WAV (if the software supports this format directly, if not, you can first select other high-quality audio formats such as FLAC, and then convert), and set the save path.
Click the "Download" button, the software will start to download the audio part of the YouTube video and convert it to the format you specified. Wait for the download to finish and you can find the converted WAV audio file in the specified save path.
3. Use of command-line tools (requires some technical foundation)