Chekc out this book by R. C. Sproul at https://www.amazon.com/What-Reformed-Theology-Understanding-Basics/dp/0801018463/ref=sr_1_1?crid=2LBBXY1IIAT7V&keywords=what+is+reformed+theology%3A+sproul&qid=1652207534&sprefix=what+is+reformed+theology+sproul%2Caps%2C128&sr=8-1