Try this melody on any and every string.
We begin with a single note, Middle E. The line on the left connecting the staff and tab = Same Thing. Tab = Notation. These reading exercises are simple and prove that you can read music on guitar. To Know → Middle E = Line 1 = 4 string, fret 2. Say it with me: the first line of the staff is Middle E, & it can be played on the 4th string, 2nd fret. We have shown the Middle E as a quarter, yet it can and will appear as different durations (whole, half, quarter, eighth, sixteenth, etc.).
Chords can be strummed, fingerpicked as blocks/fragments, or arpeggiated [broken into individual tones by picking or fingerpicking each tone separately - the tones that are picked can ring together or not ring together]. For chords, each of us choose how we finger them. This is often context dependent [what we are fretting from and to, style]. There is a spatial logic to our hands [if all 4 fingers were in the same fret space, the index would be on the lowest - pitch-wise - string, not the pinky]. Yet, this logic doesn't always have to be followed. Over the decades and even recently, I've seen some bizarre fingerings for common chords, but if it works, it works [even if not for everyone]. This is another layer of personalization for playing.