Databases are one of the 3 core systems (Database, API, UI) that make web apps work. The most common database systems use the language SQL (Structured Query Language). In this course, we install and use the MySQL database system, learn the SQL language, and use MySQL to serve as the database for an ExpressJS web app. MySQL download page: https://dev.mysql.com/downloads/ Mac download instruction video: https://www.youtube.com/watch?v=2cvH0HRjZF8 W3Schools SQL data types: https://www.w3schools.com/sql/sql_datatypes.asp W3Schools SQL tutorial: https://www.w3schools.com/sql/default.asp 00:00 Intro 01:05 Server setup 04:31 Database connection 15:29 API design 18:37 Using EJS to render the webpage 22:12 Sending form data to the API 27:35 Executing SQL queries from the server 29:16 Table design 32:59 Callback hell, the pyramid of doom 36:45 Solution: implement a promise 43:10 Saving messages 49:03 Showing messages on the webpage 56:49 Outro