Mixkit is a website that offers hundreds of free music files and videos that you can download to use in your multimedia projects. The licensing terms for assets on Mixkit are clear. You can download videos and audio files from Mixkit to re-use and remix. You don’t have to credit Mixkit, but they will appreciate it if you do.
https://www.freetech4teachers.com/2020/02/mixkit-hundreds-of-free-music-and-video.html