[LEAKYSEALS951]

A bunch of stuff.
Cars,
Appliances,
Tractors,
House (how to remove individual shingles and replace them, etc...)
How to smoke a cigar
How to tie a windsor knot

As mentioned in other post here (on ppot at other times) and elsewhere, it's best to watch as many videos as possible on the subject to get an average on what people are doing. I am always amazed at how many people post stuff, who have never worked through it before and film their own newbie mistakes in real time. For pete's sake- at least do it once before you post it like you are a professional!
I can learn as much as what not to do as what to do by watching youtube -but thats not a slam. Youtube is a great asset. I use it for cars more than chilton / etc any day.