A very silly one here, but we all have to learn somewhere right?
When I started the 180 AV department, I needed to learn about video myself, so I purchased a Sony HC1 HDV camera and some pieces and taught myself to shoot and edit.
What I learnt was my wife doesn’t like being on camera, and cats walk away, so I had to film myself.
I also learnt the hard way about backing up Final Cut Projects and keeping master copies of edits. This was 2006 when YouTube was 4×3 and despite shooting and editing in HDV, this is my only copy.
But I do have more views than some agencies viral videos! 😉