A free way to record computer sound using the free ShareX screen and audio capture. Except recording sound from microphone, it is also able to record internal audio from your PC speaker.
Audio knowledge, tutorials
Two free internal sound recording solutions for Mac. Soundflowers and Video Converter review and comparison.
How to record online radio and music from internet on Windows PC using Audacity for free?
Use Adobe Audition to record system audio, any sound, music playing on your Mac computer.