Understanding that the derivative is just the slope of a curve at a point (or the slope of the tangent line)
Practice this yourself on Khan Academy right now: www.khanacademy.org/e/skill-check--tangent-lines
Watch the next lesson: www.khanacademy.org/math/differential-calculus/taking-derivatives/derivative_intro/v/tangent-slope-as-limiting-value-of-secant-slope-example-1
Missed the previous lesson?
Differential calculus on Khan Academy: Limit introduction, squeeze theorem, and epsilon-delta definition of limits.
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