free noise reduction plugin for davinci resolve

I'm sorry, I should have been clear that the videos and training materials are where I started. So I think the answer to your question has mostly already been answered by you - to get good audio in Fairlight you'll need some more time and familiarity with Fairlight itself, and learn more about the audio production process in general. While I have a suite of very powerful Noise Removal tools, I find the Fairlight included one's pretty decent for less complex tasks, and more than up to the task for regular broadband and impulse noise reduction. Noise removal and forensic audio is a complete field, maybe you got lucky with a preset someone shared in a video, but more often than not you'll have to do some work to identify and minimize or eliminate noise. A course helps you get up to speed so much faster, so you can spend time doing the work, learning new techniques and delivering great content rather than trying to figure out what feature is hidden in which menu.

I found it immensely helpful (I did the online webinar version with one of BMDs instructors) even though I have almost 20 years of experience working with audio, both music and post production. There's a book, videos and audio examples to take you though each part of audio post production.

I would suggest and recommend that you start with the great training material available for free on BMD website.

Free noise reduction plugin for davinci resolve