Re: I need a tutorial video on how to use a symetrical spinn
Rigging for asymmetricals is much less complicated than for symmetricals, mainly due to the pole.
On an asym, there is no pole. On a symmetrical, you need a topping lift and downhaul for the pole, which holds it in vertical position. For bigger boats, there may also be a foreguy, which helps hold the pole in fore/aft position, and probably an afterguy as well. On smaller boats, the windward sheet on the spin becomes the guy, and is generally held down to the deck at roughly the shrouds by a twing line. This reverses in a gybe, and the sheet becomes the guy, etc.
On an asym, there are only 4 lines: halyard (of course,) tack line, and 2 sheets. The tack line holds, well, the tack down in front, and is played higher for deeper angles, or tighter for closer angles. Sheets become active or lazy depending on which gybe you're on. Some boats mix it up with a takedown line, which is very popular on smaller dinghies and skiffs, and so pull down and launch the chute in a tunnel or sock built in to the boat. And on a bigger boat with an extendable sprit, there will be additional lines to extend and retract the sprit.
I think this is why asyms are so popular with cruisers. They're just pretty simple to deal with, without having to worry about the spinnaker pole. And, cruisers aren't as concerned with fastest speed to the downwind mark, which on the course ought to be dead down wind, a point of sail that asyms can't get deep enough to achieve.