Please tell me how to add reverb to the audio.
Open "Effect" on the upper left, drag and drop "Reverb" in "FairlightFX" of "Audio FX" to the target clip or track, apply it, and adjust in the displayed dialog.
need to understand
If you add reverb to the track, the sound will remain after the clip ends, but if you add reverb to the clip, there will be no afterglow after the clip ends.
If you want to leave a reverberation after the clip ends, set only the target clip to a separate track and apply reverb to the track.
Easy way to apply reverb
I think that the following official video will be helpful for detailed settings.