Sound design can make a short edit feel intentional, but more effects do not automatically mean more impact. The first job is to make the voice and important actions easy to hear. Effects should support that hierarchy.
Start with the voice
Clean obvious noise, level the dialogue and listen for abrupt changes between takes. Keep a little natural ambience when a hard mute would make a cut feel artificial. If the audience cannot understand the spoken point, no transition sound can rescue the edit.
Give each effect a purpose
An impact can mark a reveal. A soft whoosh can make a movement feel continuous. A subtle click can clarify a UI action. If an effect adds nothing to the viewer's understanding or feeling, remove it. Repeating the same loud hit at every cut quickly flattens the whole video.
Place music behind the story
Choose music for mood and structure, then reduce it when speech begins. Let a musical change reinforce a real turn in the narrative. Avoid forcing every cut to a beat when the speaker needs a different rhythm. The best mix preserves both the sentence and the emotional direction.
Test the real playback conditions
Listen through headphones for clipping and through a phone speaker for intelligibility. A bass-heavy effect may disappear on the phone; a bright click may become tiring. Check the rendered file rather than assuming the timeline mix is identical.
Keep licenses and source files organized so you can revise the piece later. If you need a starting library, the Editor Store includes tools and assets for editing workflows. The sound should make the message clearer even when the viewer never notices the individual effects.