Intervals, 4th, 5th? What? Options

[ygro]

I´ve been reading the guitar grimoire, is very good but it´s in english & I´m a bit lost...

I need to confirm various things...

For example... a third interval has 4 notes, beginning in the root note???

3rd of C scale is...

C -C#-D-D#

or

C#-D-D#-E

I suppose that the second option is correct, E is 3rd deggre of scale...

THE QUESTION IS, NO MATTERwhat scale it is, a third interval will allways 4 notes beyond the root note?

another question...

what´s de meaning of the numbers in the notes over the fretboard (ex: G3, B4, etc???) and how I find can clearly in it?

I have a verry good game for my phone for learn the fretboard notes and there are a sub game in wich It says me a note (ej G3) and in the first 5 frets there are various (3 at least I think) G notes... I think that it´s not about intervals, therare only single notes...

I´m a bit lost, I want to learn some theory and need a little help.

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