Audacity is an free online tool that allows you to edit audio files, and which we use in the Fact-Checking laboratory. Load, record, edit, mix and export audio files (MP3 or WAV).
You can record from your microphone, line input or many other sources, and copy over existing tracks to produce a multitrack recording. Audacity is a resource that you can learn about in greater depth in the free global mentorship program on fact-checking.
If you wish to record your podcast on a mobile or cell phone, there are also tools such as Dolby on and the applications ASR Sound Recorder and RecForge II - Audio Recorder APK.