Audacity

Play, record and edit any audio file with Audacity, a slick and feature-rich audio editor across all platforms.

Summary

Our Score	Our Score
License	Free
Link	https://www.audacityteam.org/
	Small, fast – a lot of audio editing and filtering options
	A bit of a learning curve – not suitable for large multi track projects

Details

Audacity is an easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems, developed by a group of volunteers as open source.

Sure, it is not a professional DAW but for a free and light-weight product it provides a whole lot of  audio recording and editing features. You want a quick start on learning to work with audio files, this is the product to start with.

I used it myself once to filter out some disturbing noise from an audio recording and was stunned about how well the result was in the end. I learned a lot from the large community and also from the detailed online manual.