Arthur Ullrich – Day Trading The S&P 500 Futures Contract Manual
This guide was written by Arthur Ullrich from Trade Tutor. He used to write a popular trading newsletter and various courses on day trading and futures. He has passed away and his site is no longer online, but his info is high quality.
This manual is extensive and filled with his knowledge that stands today just as it did the day he wrote it.
His site is only available on archive now: https://web.archive.org/web/