Back in the day the conventional advice was LAMP, Linux, Apache, MySQL, PHP. A lot has changed since then, but I'd say conventional advice has not changed much beyond the current equivalent stack:

Linux, Nginx, MySQL, Node.js/React/Express.

Nginx eventually overtook Apache. PostgreSQL is very popular but MySQL is still more widely used. The JavaScript ecosystem has not been displaced by much, although in recent years Go has made some ground on the backend.

If you learn Linux, Nginx, MySQL, Node.js, React, and Express, you can get hired almost anywhere today.

Just read the documentation. Most newbies do not.