YouTube Vanced is a YouTube substitute app on Android with built in ad blocking, background play, background music play etc. which the stock app does not have.
This is a direct link to download YouTube Vanced APK version 14.21.54.
This is a non-root app so this needs the microG to be installed which will help you connect to Google account to be able to access all personalized YouTube experience.
You can get here the microG for YouTube Vanced.
To know more about the app or to know on how to install and use, visit the YouTube Vanced APK download page.