The three questions that most often turn a cheap lot into a bad one, and how far free public data gets you on each before you spend money on professionals.
Legal access vs physical access — a road on the map is not a right to use it. What the Road access row can tell you, and where the rest lives.
Will it perc? — what the soil survey's septic rating means, what it cannot promise, and how to screen a parcel before paying for the test.
How to read a flood map — zones A, AE, X, V and the floodway in plain words, and what a zone does to building, insurance and resale.
General information, not legal, engineering or financial advice. Confirm anything that matters with the county and a licensed professional.