Any suggestions how to clean up both the visual and audio quality of a video?

Hi. I don't even know if I am posting in the right group or not, but I have a video that is in need of both visual and audio improving. I recorded it on my phone, and it's from a comedy show. I downloaded EDITS, and when I try fixing the audio, it makes the laughing sound weird. I'm trying to make the video look better, and sound better. I'm no longer tech-savvy, ergo, I don't even know what to download and if I did, how to even use it. Pretty sad, I know. Any suggestions would be great, and I thank you from the bottom of my heart.