2.5. Downloading reusable resources or video excerpts
YouTube uses CC licences on its content, allowing creators to grant use of their work as standard. Until September 2021, users could mark their videos with the CC BY licence, generating an automatic signature and indicating that Creative Commons content was being used. Attribution now continues to be added to videos through description updates.
With CC licences, creators retain the copyright, but others can reuse the video under the terms of the licence.
To learn more about the use of Creative Commons videos on YouTube, you can read the following information at https://support.google.com/youtube/answer/2797468?hl=capport.google.com/youtube/answer/2797468?hl=ca
Furthermore, this tutorial also explains in detail what you can do as a YouTube video editor, including editing the audio part. You also have the information provided by YouTube about editing videos and their settings.
On Vimeo, there is also the option to search for Creative Commons videos that are available for download and further use. The Pexels platform also has 4K videos that you can use for free for personal and commercial purposes without attribution under the Pexels licence.