alrighty-o. I have heard that its very important to know your triads and many voicings. I know 4 voicings of major and minor triads. Is it right that the only triads left are Augmented,Diminished, suspended4, suspended2 because the rest are four notes which are not triads?
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Tri means three.

Although I'm not 100% on this one, I'm going to have to go ahead and guess that four notes =/= triad.
the suspened "triads" that you mentioned are not triads but i am not trying say that you shouldn't learn them, they could sound cool.

the triads are major, minor, augmented, and diminished.

a triad is formed by taking a scale and taking the root, 3rd and 5th notes.