Chapter 1: Introduction

Chapter 2a: Practice Environment/ Problem-Solving/ Function Evolution

Chapter 2b: References and Reference-Locking

Chapter 3: Aggregation Functions

Chapter 4: Date & Time Functions

Chapter 5: Text-Related Functions

Chapter 6: Logical Values, Logical Functions, Conditional Calculation

Chapter 7: Conditional Aggregation Functions

Chapter 8: Data Lookup and Retrieval