Always downshift before stopping. Its much easier to start moving again from a lower gear, especially when your pulling a trailer.
When stopping for a break after a hard ride, leave your helmet upside down in a sunny spot, unless you like the feeling of putting on a soggy sweaty helmet.
Your biking gloves probably have a nice soft material on the back of the thumbs (see picture). these are great for wiping up the liquids that come out of your body, but do yourself a favor and designate one hand for your forhead and the other for your nose. You’re in for either a mess or a wind protected forhead if you don’t. (and you can forget about leaving any comments here about any other liquids you might have thought about wiping up.)