Decode the instruction accurately
A slash chord combines a chord name with a specified bass note. D/F sharp, usually written D/F#, means D major with F sharp in the bass. The right hand can play notes from D major while the left hand supplies F sharp beneath them. It does not instruct you to alternate two unrelated major chords. Start with a comfortable register and sound the bass separately so that you can hear how the inversion changes the direction of the progression without changing the underlying triad.
Practice the bass as a melody
Take a progression containing a slash chord and play only the written bass notes. Sing their movement and count the duration of each. Then add simple right-hand chords while keeping the bass equally clear. Avoid doubling low notes so heavily that the line becomes muddy. If the next bass note is close, use a relaxed movement; if it is far away, prepare the shift during the preceding sustain. The bass line deserves phrasing and reliable timing rather than being treated as an afterthought beneath the more visible right-hand shapes.
Distinguish sustained inversions from passing notes
In a recording, a quick bass approach may create a momentary slash-like sound without requiring a separate full chord. Verify a surprising AudioChords label by listening before and after the event. Try holding the right-hand harmony while moving only the left-hand note and compare the result. For a simplified accompaniment, that may express the passage more naturally than rebuilding both hands. Keep the chart's level of detail consistent with your arrangement. A slash chord is most useful when it communicates an audible bass choice that you can repeat clearly and coordinate with any other musician covering the low register.