Revit's Drafting Machine

Overlooked by many beginners... For those of you who remember using drafting machines mounted to a drafting table you'll find a similar tool in Revit. Just turn on your Workplane (blue grid icon), set the spacing of its grid, and rotate the workplane to any angle you wish. Now any lines or walls that you draft will snap to the gridlines of your workplane. I recommend you use this feature if a wing of your building is not orthogonal.