In music theory four part harmony voice leading when going from V7 to I, the flatted 7th resolves down 1/2 step (in major) and the major 3rd resolves up 1/2 step.
In other words Ti, the leading tone, leads up to Do. Fa leads down to Mi. In the key of C, the flatted 7th of G7 is F which is Fa in the C scale, and the 3rd of G7 is B natural which is Ti in the C scale. F resolves down to E (or Eb in minor) which is Mi in the C scale. B resolves up to C which is Do in the C scale. In classical music as in jazz, the harmony is defined by the 3rd and 7th of the chords which are considered the "essential" tones.
All other voice leading is generally to the closest tone in the new chord. In 4 part chorale writing, the bass line is dictated by the harmonic progression and can jump all over the place. The soprano voice is the melody so it can contain leaps. The alto and tenor voices are the ones controlled by good voice leading practices. The tenor voice can come out a bit awkward however, since it tends to get the "leftover" notes after the first 3 have been taken by SAB.