Audacity Manual - Restoration
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Free open-source tool with restoration plugins.
More resources on Audio Restoration
Acon Digital Restore
Free trial and guides recommended in Reddit threads.
iZotope RX Resources
Official free tutorials and modules for audio repair.
The Audio Restoration Podcast
Join Eli in his mission to help people awaken to their true nature using spiritually based techniques. This is the audio feed of Eli's video talks. Hosted on Acast. See acast.com/privacy for more information.
izotope.com/learn
iZotope Learn is the company's education hub offering tutorials, articles, webinars, and guides on audio restoration and production, including how-tos and tips on noise reduction, spectral repair, and restoration workflows using iZotope tools.
soundonsound.com
Sound On Sound is a long-running audio engineering magazine and website offering in-depth tutorials, practical guides on recording, mixing, and mastering, plus gear reviews and studio-based tips.
Digital Audio Restoration
Digital Audio Restoration - A book resource