Beermoney & Tax Returns

So, I was browsing the post about beermoney and tax returns, and I have questions that weren't answered. And I was hoping someone here might be able to answer, or point me in the right direction. Btw, I don't have a tax professional.
I'm going to attempt this on my own. So, any help/info is appreciated.

Questions I have:

1. Do I need to report all earnings from every site, even if I never earned over $600 per site for a given year? Or do I only report the sites I earned $600 or more on?
2. What do I do if I earned over $600 from one site, in a previous year, but didn't know I needed to file?
3. If I do need to report all earnings from each and every site, what form (s) do I need to file? Do I need to file a form for each different site I've used?
4. What do I file this as? Self-employment? Other? Hobby?

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source https://www.reddit.com/r/beermoney/comments/efi1gq/beermoney_tax_returns/