GIPS - Level 1

So I noticed in the Schweser notes it states that for L1 we are responsible for: “only the “Introduction to the GIPS” and the Preface, Section I, and Section II (through II.0: Fundamentals of Compliance) of the GIPS document” (Schweser Notes, L1 B1, pg 82). I find this confusing because when you go to the actual CFAI primary readings (Reading 3 - 4: The GIPS Standards), the Preface is stated as an “optional segment.” Also, the Sections I and II do not match up to what Schweser is stating. Section II in the CFAI readings (reading 4) is cited as a completely optional segment. This confuses me. I wish Schweser did a better job cross references the primary sources. Any insight is appreciated. Thanks everyone and happy new year. -RF