Sound Files are the backbone of many videos. Our watching experience is 50% sound.
Typically in our editing sound files are either WAV or MP3
File Sources:
Use a site like freesound.org
Use a GOOGLE search for specific files like "psycho.wav" or categories of wav files (there are thousands of websites that host sound effects)
Note - depending on the speed of your computer, the sound can be very "choppy" when played in Premiere's editing window. The final rendered H264 file will sound considerably better
Some places you might search for free sound effects and full creative commons songs/soundtracks:
Jamendo (full piece downloads) <note: can no longer use Google Button with your OCDSB account>
purple-planet.com (full piece downloads)
soundcloud.com (requires free account creation - search for FREE as a keyword - full piece downloads)
Noteflight (note for note composition)
opsound.org (loops & some effects)
ccmixter.org (loops & some effects) - seems to be blocked atm
looperman.com (loops)
BandLab (music creation)
Soundtrap (music creation)
freemusicarchive.org (much older music)
FreeSound (requires free account creation)
/r/AudioPost - a place to discuss sound editing and mixing for media
/r/GameAudio - discussion about the process of creating audio for games
/r/LocationSound - for those who record sound to picture in the field
/r/RateMyAudio - when you need a critique for mix, mastering, or some other facet of audio work.