Useful SSRS expression syntax

=IIF(Fields!a.value>100, True, False)

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=IIF(Fields!a.value >=10, "Green", IIF(Fields!a.value >=1, "Blue", "Red"))

values >=10 are green, between 1 & 9 are blue, less than 1 are red

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=SWITCH(
    Fields!a.value >=10, "green",
    Fields!a.value >=1, "blue",
    Fields!a.value = 1, "yellow",
    Fields!a.value <=0, "Red")

>=10 are green, between 1 & 9 blue, =1 yellow, <=0 red

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SWITCH function finds the first expression that's true. It will not catch errors further along.
IIF function evaluates all parts of the expression.

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=IIF(Rownumber("scope") Mod 2 = 0, "Khaki", "White")

set "scope" to reset row colours for every group

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