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 **Versioning.** Unless stated otherwise, examples target the current stable release. Anything that requires a specific minimum version (e.g. `gen_random_uuid()` is built in from 13, `MERGE` from 15) is called out in the lesson. Use the newest PostgreSQL you can; the language and tooling improve every year.
 
+**Interactive Version.** You can also read and track your progress through these lessons on the web at [psql.zerodaily.in](https://psql.zerodaily.in).
+
 ## Table of Contents
 
 ### Getting Started