Newbie-ish question about ( [ and [[

I guess I'm a little dense, but I just don't get it.

When, and most importantly why do you use ( [ and [[ in shell scripts?

I'm trying to construct a simple:

if ( some-test-goes-here ) or [ some-test-goes-here ] or maybe even [[
some-test-goes-here ]]
then
blah
fi

construct and I am not sure when or why to use one of the three
different kinds of brackets.

Can someone point me to a resource?

Thanx!

.

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