Let me share you some tips for that I got from my bunch of files. I cannot link to the main source since I don’t have it . All I can say based on the documents I have this is a reprint from PCWorld.
One common type of spreadsheet is a fill-in-the-blanks template. Typically, such a sheet will have a number of input cells, and a number of formula cells. You enter your data in the input cells, and the formula cells kick into action and use those values to display some type of (usually) useful result.