With attribution-free Creative Commons Zero (CC0) licencing, you can use Pexel stock photographs without having to worry about rights infringement. They also offer a wide range of videos and both pics and footage is easy to search through without having to waste time scrolling through irrelevant stock. You can edit any photo. The site does include sponsored pictures and videos where you are taken to their website and will probably have to pay a fee. However, Pexels stock is completely free and highly recommended.