I know this is WSB, but here is the classic introductory textbook: https://www.amazon.com/Options-Futures-Other-Derivatives-Global/dp/1292410655/ref=cm_cr_arp_d_product_top?ie=UTF8

Don't worry about getting the exact latest edition. The only thing I can guarantee is it will not waste your time. You may not be able to get through the book (I haven't), but if you can't, that says something too, right? This book or something similar is basically step 1 for professionals in the options biz. If you read this book and think it wasted your time, please find me a year later, two years, doesn't matter, and I will give you a very public and heartfelt apology.