Reddit reviews Acing Intellectual Property (Acing Series)

I'd recommend getting a short horn book on IP in general. Here's one written by my professor, it's pricey for how tiny the book is, but I found it helpful. https://www.amazon.com/Acing-Intellectual-Property-W-Robinson/dp/1634602730

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Trademarks are pretty straight-forward in general, and a lot of owners file the applications pro se. but there are a lot of caveats/maintenance proceedings that can be easily overlooked. PTO has some intro videos on the basics of TM: https://www.uspto.gov/trademarks-getting-started/trademark-basics

For copyright, the copyright office actually has a series of documents called "circulars" that covers a lot of the basics of copyright: https://www.copyright.gov/circs/