To sign in to YouTube, you’ll need to create a Google Account. With a Google Account, you can access many YouTube features, including Like, Subscribe, Watch Later, and Watch History.
Learn more about using your Google account for YouTube: https://support.google.com/youtube/answer/69961
Learn about creating a YouTube channel: https://support.google.com/youtube/answer/1646861
How to sign in to YouTube: https://support.google.com/youtube/answer/161805