Update free-courses-en.md (#8492)

Added a course

courses/free-courses-en.md

@@ -432,6 +432,7 @@
 * [Introduction to Databases and SQL Querying](https://www.udemy.com/course/introduction-to-databases-and-sql-querying/) - Rakesh Gopalakrishnan (Udemy)
 * [Introduction to Distributed SQL and CockroachDB](https://university.cockroachlabs.com/courses/course-v1:crl+intro-to-distributed-sql-and-cockroachdb+self-paced/about) - Lauren Hirata Singh and Will Cross (Cockroach Labs Inc.) *(email address required)*
 * [Learn SQL](https://popsql.com/learn-sql) - PopSQL
+* [Learn SQL: SQL Tutorial for Beginners](https://www.programiz.com/sql) - Programiz
 * [MySQL Tutorial for Beginners [Full Course]](https://www.youtube.com/watch?v=7S_tz1z_5bA) - Moshfegh Hamedani (Programming with Mosh)
 * [SQL Foundations](https://www.udemy.com/course/sql-essentials-for-beginners/) - Sagar Uppuluri (Udemy)
 * [SQL Tutorial](https://www.youtube.com/playlist?list=PL_RGaFnxSHWr_6xTfF2FrIw-NAOo3iWMy)