Well, I started diving into a bit of theory recently (I'm only at the major scale), and I've become a little stumped.

My key signature problem:

Okay, I don't understand these at all. How do I know what key something is in?

Taking the C major scale for example: C D E F G A B
Would the scales in the key of C major be C major, D major, E major, F major, etc, or would I used the circle of fifths to find the scales in that key, which would be C major, G major, D major, A major, E major, B major, F# major, etc. Sorry if it's not comprehendable, I'm a complete theory nubsauce.

When you form a triad, would you just use the first, third, and fifth note of a scale, or are there other possibilities as well?
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key signatures are found useing sharps and flats. each key senter has a number of flats or sharps. you start off finding the related major of the scale. there are lots of res. on the net you can look up through google and on here.

triads are built of the 1st 3rd and 5th. and the invertions of them. all invertion means is your lowet note is different from a note other than the root of the chord
Quote by GuitarFreak1387
key signatures are found useing sharps and flats. each key senter has a number of flats or sharps. you start off finding the related major of the scale. there are lots of res. on the net you can look up through google and on here.

triads are built of the 1st 3rd and 5th. and the invertions of them. all invertion means is your lowet note is different from a note other than the root of the chord

I understood about 3% of that, but thanks anyway.
It all makes sense
We're capable of beauty
Through sounds that make on cringe
The dogs only hear us now

if you're in C major, the only scales you would use are C major, A minor, and variations of these scales.
I think you mean the chords of a key signature, which in C major would be C, D minor, E minor, F, G, A min, B minor (to keep it simple).
a triad doesn't have to be the 1st 3rd and 5th, that is just the major triad. A minor triad is 1, b3, 5
a diminished triad is 1, b3, b5
an augmented triad is 1, #3, #5

a triad is any chord with only three notes (powerchords don't count, they have two of the same note)

hope you understand this, and i haven't been to technical (i tried to keep it simple for you)
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thanks for the compliment man!
Ahh, thanks man.

It all makes sense
We're capable of beauty
Through sounds that make on cringe
The dogs only hear us now