SQL Server Index Structure and Concepts

SQL index overview and strategy

SQL Server Index Design Basics and Guidelines

Microsoft Clustering in SQL Server

Overview of SQL Server Clustered indexes

Designing effective SQL Server clustered indexes

Clustered vs Nonclustered: Index Fundamentals You Need To Know – SQLServerCentral

Using SQL CREATE INDEX to create clustered and non-clustered indexes

Clustered Index vs. Heap in SQL Server