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Re:At 1 Hz the sound waves were breathing for the dog by personalcompute on Saturday November 05, 2022 @01:43AM (#33478337)
For #1 I can highly recommend this interactive article by Bartosz Ciechanowski: https://ciechanow.ski/sound/. It might lack the depth you want in intermediate or advanced topics, but in my opinion it is the most efficient and effective beginner education material out there.
Re:At 1 Hz the sound waves were breathing for the dog by rramadass on Saturday November 05, 2022 @06:31AM (#33480043)
Nice site; the interaction aspect is particularly good.

Thanks for the link!

I also found this "University of Southampton" site on Sound really helpful : https://blog.soton.ac.uk/soundwaves/