Guitar: D 7 in the Changes
Where D 7 sits once the key is named, and what this seat is responsible for while it sounds.
D 7 is D – F# – A – C. Naming the notes is where a chord chart stops. A tune asks the next question instead, and that is the one this page answers.
Nine times in ten a chart puts D 7 in the dominant's place, and the blues tonic after that — so before working out a voicing, work out which key makes it that, because the key decides which notes the rest of the group has already taken.
The guitar seat carries the comp — the changes stated in three and four notes behind whoever is playing the melody, which in practice means dropping the root and playing the notes nobody else is covering — the third and the seventh first, everything else only if it fits under the hand.
Every shape is drawn for EADGBE across 6 strings, the open ones first and the movable ones up the neck after them, and each one plays back so you can hear the voicing before you commit it to a chorus.