Perhaps that’s overstating the situation….I’ll qualify that with “…everything useful I know about bicycles…”…=-)
Just as an example I was having issues with my chain being too slack on my Pusgley. Seeing as it’s my first bike with horizontal dropouts I lacked the skill set to get the tension right. I tried 6 or 7 times, but by the time I got the wheel pulled back, straightened and the hub tightened the chain ended up too loose. I started to think this is a 2 man job, but that didn’t make any sense as people had to ride these bikes alone and deal with removing/installing a wheel. There had to be an easier way.
I was about to post a question on a bike forum about this when I thought to myself I can’t be the first person to have issues getting their rear wheel adjusted correctly in horizontal dropouts. So I checked Sheldon Brown’s pages and sure enough he has a page about chain tension on fixed gear bikes. I read. I learn.
Then I go back to my Pugsley, lube up the axle nuts and start walking the wheel back as Sheldon describes. Presto tight chain and straight wheel! Sweet. Thanks Sheldon…=-)