Is there any boating courses out there that a person can take to teach
you
how to manuever a boat ?

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No. You will need to rely on private instruction, aboard the boat you
plan to operate. One challenge is that each make and model of boat will
handle at least slightly differently, down to an including facts like
Brand X as built at the factory will handle differently than Brand X
with an additional 150 sq ft of optional canvas catching a cross wind.
Books and videos teach the general theory of docking on a perfectly
calm day with plenty of space available, but some boats behave very
differently from the examples the books and videos use, it is seldom a
perfectly calm day, and count on being required to side tie your
40-footer in a 50-foot gap along the face of the float more often than
not.

You can't simply hire the dock boy or some other marina worker to show
you the ropes. In fact, if you hire anybody, they need to be a licensed
master. You might want to give that fact some serious consideration, as
should something go so wrong during the training that your insurance
company becomes involved you wouldn't want to give them a "fine print"
excuse to tell you to take your claim and shove off. You wil either pay
$ome big buck$ for profe$$ional training, or get taught by a volunteer.

The best source of volunteer training is available when you first
purchase the boat. If you buy it from a private party, that person has
quite a bit of experience handling that specific boat, and even though
he or she may not be a professional instructor they can probably give
some very good instruction based on a familiarity with that boat. If
you buy from a brokerage, ask the broker to give you some basic
pointers in docking, line handling, etc. Not to represent yacht brokers
as the consumate seapersons, (many are not), but one skill that a
broker develops early on is the ability to manuever a broad variety of
boats around typically very crowded brokerage docks. As long as the
broker isn't getting paid for instructing, (and he isn't- he or she is
paid by the seller for sevices rendered and not by the buyer), you're
not jeopardizing your insurance coverage.