Some content I reference, share, and/or use.

Sound Effects/Music

Adobe Audition CC 2018 Sound Effects
Adobe Audition CC 2018 Music Loops
Soundsnap
MotionSound.io
Soundly
EchoCollective Explainer Sounds
MotionPulse by VideoCopilot
Boombox by Mt. Mograph
Soniss Professional Sound Packs

Random

Adobe CS6 Encore Library
Adobe Photoshop CC 2018 Kyle Brushes