This document provides instructions for a lab on understanding SQL commands and SQL injection. The lab objectives are to learn basic SQL commands, querying data with SQL, deleting data with SQL, and conducting SQL injection. The lab is split into 4 sections - the first 3 sections guide the user through basic SQL commands like creating databases and tables, inserting data, and deleting data. The final section demonstrates how to exploit SQL injection vulnerabilities by manipulating queries on a vulnerable web application. The document outlines the virtual machines used, login credentials, and step-by-step instructions for completing each section of the lab.