Though most content will be contained here on the class website, if you're more inclined to practice, absorb, and excel using a book, some great suggestions are here: Fluent U's "Best books to learn Spanish".
There are many Spanish-English Dictionaries, "Do-It-Yourself" books, "Spanish For Dummies", etc., as well as hours upon hours of YouTube videos. Before you buy another book (or spend your off-hours trapped in an endless YouTube black hole of Spanish How-To Videos), send me an email with the link or picture of the book and our team will let you know if it's worth your time.
Just because a lot of content is out there doesn't mean it's been professionally curated and actually useful towards learning Spanish, its grammar/sentence structure, and a respect for the language through a Culturally-Appropriate lens. YouTube, especially, is awash with Spanish 1 students, children, and amateurs who have access to a computer, a webcam, and have lots of time on their hands. This doesn't make them fluent, reliable models, or useful on your Spanish journey. They might actually be counter-productive and poor models, contributing to dysfluent habits that may be hard to kick later!