basic minimum syntax of plot command to plot a function f
as a function of x over the range [xmin, xmax]:
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Plot[f, {x, xmin, xmax}]
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extended syntax to specify additional options:
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Plot[f, {x,xmin,xmax}, option->value, option->value, ...]
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options of interest for axes labels & titles: AxesLabel, PlotLabel
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example:

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Plot[Sin[x], {x,-6.28,6.28}, AxesLabel->{"x", "y=sinx"}, PlotLabel->"Plot of
sin(x) over [-2pi,2pi]\n\n\n\n\n\n\n\n"]
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The newlines at the end are a workaround to compensate for the fact that
Mathematica positions the label poorly, too low on the page so it obscures
the plot itself.

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 (courtesy of TR)