Freesound.org- Freesound is a pretty good web site to use if you are look for some free sounds and effects. I would use this website for doing projects.https://freesound.org/


Morguefile- Morguefile has over 380000 high quality, high resolution photos. This web site is free for people to use and you will not get copyrighted by using it.https://morguefile.com/ 


Flicker- Flicker has tens of billions of photos and seems to be a good and easy website to use. 
https://www.flickr.com/