Real Analysis: A Long-Form Mathematics Textbook https://www.amazon.com/dp/1724510126/
This book enters the pantheon of books that were tremendously helpful to me: Learning to Reason by Nancy Rodgers, Discrete Math by Susanna Epp and Linear Algebra by Kuldeep Singh.
I actually wrote a longer comment, but I had to invoke the names of other authors. Better not. Either way, I love the book.