audio

https://freesound.org/
Freesound aims to create a huge collaborative database of audio snippets, samples, recordings, bleeps, ... released under Creative Commons licenses that allow their reuse.
You need a free account login to download.

YouTube audio library 
Part of the YouTube studio (login required)
In the Audio Library in YouTube Studio, you can find royalty-free production music and sound effects to use in your videos & projects. Music and sound effects from the YouTube Audio Library are copyright-safe.