Dear Stephanie, Welcome to Udemy. Audio quality is very important in success of course. As per recommendations of Udemy, i will also highly recommend you to use Audacity. The use of Audacity is pretty easy. It also provides you option to get only audio from the video files. For this you need to install an extra plugin in the audacity which is ffmpeg. The link for this is provided below https://manual.audacityteam.org/man/installing_ffmpeg_for_windows.html Once you will install it then you just need to drag the video files in Audacity and it will automatically extract all audio from your video files. There are some good tutorials available on YouTube regarding use of Audacity. Meanwhile, you alos need to silent your video. For this one you can use number of different softwares. Once you have your clean audio and silent video then you can join them again. I can understand that this will be laberous work but let me assure you that it will greatly help you to make good quality content. Good luck dear.
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