Thanks for checking out the lessons. I used to use an iPhone to record my early video lessons. You can get an external microphone that plugs in so you can get even better quality.
Another to check out for audio recording would be the Zoom recorder. They have a bunch of different models but they’re very good for audio recordings in the “field” and make really good quality recordings.
Several of my musician friends use them to record when they’re on the road.
You could also record the audio and video separately (with an iphone and zoom for example) and then sync them together in Garageband or Pro Tools after you record.
Thats what I do with my video lessons now. That way you can have better audio quality than the video camera microphone.
If you have any other questions let me know.