For anyone interested in a really good biography on Tesla, this [0] is the best one I've read. It's written by John J. O'Neill, a journalist who knew Tesla personally for 30 years or so IIRC. It sticks to the facts, eschewing the various myths about aliens and such that tend to stick to him, and it covers his whole life, from what is known of his childhood all the way through his death. It's a super interesting read.

[0] https://www.amazon.com/Prodigal-Genius-Life-Nikola-Tesla-ebo...