Title, date, scale, sheet numberRead it every time you open a sheet. It tells you which sheet you hold, whether it's current and at what ratio it was drawn. Anything missing here is worth writing down.ScaleScaleThe stated scale converts drawn size to real size. It only works if it's stated, and if the sheet hasn't been resized when it was printed or shared.LegendLegendThe decoder for this sheet. Every symbol and abbreviation should be explained here or follow recognised convention. An unexplained symbol is a question to ask, not a meaning to guess.Orientation
This is the simple version, the other consideration is the 3d build