In this tutorial you will see how to add audio to video using Shotcut
First add / import the video. Now add this video to playlist, and add a video track on timeline, drag and drop this video on timeline. Click on the play button to check the video one more time.
Now import audio file. Now add audio track on timeline, drag & drop audio clip on audio track. Adjust the audio clip with video. Now click on the play button to check it. So this way you can add audio in shotcut.