There are many attachments and other tractor parts that I did not know what they were until reading about them on this forum and sometimes having to Google them.
A sample of things I didn't know a year ago but by far not all of them.
PHD- post hole digger
TLB- Tractor, Loader, Backhoe
FEL- front end loader
The usefulness of 4wd (four wheel drive) on a small tractor.
That it is easier to mow with a Hydro drive than gear drive tractor, especially when slowing down to go around things.
What a Flail mower is ( I haven't seen one in person but evidently they are expensive and don't work very well and start a lot of arguments on forums)
That Kioti is really pronounced Coyote even though it really looks more like a Kubota.
That chains really are better for tying down your tractor on a trailer than straps. (even though I stubbornly used straps until my 20 year old told me what a pain it was to avoid all of the sharp edges)
What a bunch of smart and nice people there are on this forum.