If you want a non-bullshit view of Tesla, read his patents. His real achievement was that he figured out most of the kinds of modern AC motors. It's not at all obvious how you get an AC motor started and turning in the right direction. Clever tricks with bits of copper in the magnetic circuit are used to bias starting direction, and synchronous motors start up as induction motors. Tesla worked all that out
Like Edison, Tesla had a surprising knack for suddenly inventing and patenting things that had been invented shortly beforehand by people in other countries, and then failing to credit the original inventor while pocketing their profits; the modern induction motor is one example. Galileo Ferarris worked it all out and published in 1885; Tesla (supposedly independently) invented it and filed for a US patent on it a couple of years later, and Tesla and Westinghouse abused the patent and court system to deprive the original inventor of credit and rights (Even if Tesla actually did come up with it independently, he was second to the table).
Walter Bailey had also demonstrated induction motors in 1879, but they were a more primitive design.