SQL index overview and strategy

Types of SQL Server Indexes

SQL Server Index Design Basics and Guidelines

SQL query performance tuning tips for non-production environments

Poor SQL query design - a SQL query performance killer – the basics

Advanced SQL for Query Tuning and Performance Optimization Online Class | LinkedIn Learning, formerly Lynda.com

SQL Server Query Tuning tips for beginners with practical examples

SQL Query Optimization - Tips and Techniques

Query optimization techniques in SQL Server: the basics