what is best way to upload youtube videos to avoid copyright issue

I always see videos on youtube with music videos and videos of people with mainstream songs and they play fine and put adsense. I tried to upload a video for a project with an old Buffalo Springfield "For what its worth" and it muted my whole video and said it was violation of copyright laws or something. Also my video was all choppy, anyone know about that either? Thanks
so my question is where people get videos to avoid copyright how they put videos without facing copyright issue and...

what is best way to upload youtube videos to avoid copyright issue

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