Blue Yeti USB microphone. There comes a time when the integrated mic in your laptop or webcam just won’t cut it anymore. This mic doesn’t take up much space and offers exceptional recording quality.
Audacity is a free audio editor/mixer that I use for all my audio recordings. It’s fine if you don’t need anything fancy.
Free-stock-music.com is a large source of free stock music for your videos or other projects. Just put some reference text in the description of your videos and you can use their music.
Zapsplat.com is a free source of sound effects for your videos. It’s much like PinClipart for audio clips.