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We've had a look at intervals ('diads') and now we'll look at triads. The notes at positions 1, 3 and 5 are very important to making chords. OK. Take the root, 3rd and 5th of any scale, and you've got the major chord. So D major would be:
| 1 | 3 | 5 |
|---|---|---|
| D | F# | A |
because the scale of D is:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|
| D | E | F# | G | A | B | C# | D |
You can take the notes in any order, anywhere on the fretboard and they'll sound a D major of some description.
Some sound better than others. Find the ones you like and / or are easiest to play.
If you want to know the technical difference between them, have a look at inversions
