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Shading or color manipulation Light & Shading ;)
Gaussian Blur blurs image but you can use it to soften mask edges and to create different effects like Glamour glow.
size placement detail line color
In a drawing, a centre line is used to show the centre of a part.
Any "straightedge" whether it be the side of a book, piece of paper, etc. can be used to create a straight line. Rulers, are common straightedges, as they are tools specifically meant to draw and measure lines.