How to color a curve

Your plot

c = ContourPlot[y^2 - x (x - 1) (x - 3) == 0, {x, -2, 7}, {y, -4, 3}]

enter image description here The region you would like colored

R = RegionPlot[y^2 - x (x - 1) (x - 3) < 0 && x < 2, {x, -2, 7}, {y, -4, 3}]

enter image description here

Both plotted together

Show[c, R]

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Try without "==0"

ContourPlot[y^2 - x (x - 1) (x - 3), {x, -2, 7}, {y, -4, 3}]

enter image description here

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