I'd like to have something on the site we can point people to when they make basic beginner mistakes, along the lines of F. Warren Bittner's lecture "Ten Genealogical Lessons I Learned the Hard Way".
For example: we often get posts asking for the correct spelling of surnames as people try to bring their twentieth-century sensibilities about standardized spelling to genealogy.
It is more productive for researchers to work up a list of spelling variants to search for.
Even if a person is looking for living relatives in the modern-day phone books of the 'home country', I think it might be more productive to ask "what spelling variants are in use today?" instead of asking "What is the correct spelling?"
If we were to work up a set of "lessons learned" posts, how might they best fit with the SE format? As a series of self-answered questions, or as a Meta post where everyone could submit an answer to illustrate each problem?