Unless you are a skilled and prolific videographer, photographer and musician all rolled into one, odds are that you’re going to need to use videos, photos and music that were created by others on your website and in your products and marketing (this is called stock media).
But you can’t just use any stock media willy-nilly. You have to have a license to use it. Thankfully, you have plenty of options where you can find media that is freely licensed to use (that means you can use it in your stuff without any worries).
Here are my best recommendations for stock media. Some are free, others are not, but there will be something for everyone: