[header] How to use a speed square [title] Identify where the line should be drawn. [step] Depending on your project, decide where you need clear, concise lines to be drawn. Because the use of a speed square will vary depending on the project, create a plan specific to your needs and decide exactly where lines must be drawn. 
Use the square to locate and mark studs, position floor joists, lay out stair stringers, determine roof pitches, any other project that is dependent on straight lines. [substeps] Creating a plan and knowing where you need the lines to be will help you plan ahead and make less mistakes.