"They’d have to learn about ...". They would also have to learn some database including setup and maintenance, some build process (say webpack), using the shell is often imperative, setting up encryption (https), setting up a certification authority (say letsencrypt), using ssh, some deployment path based on one of the services such as AWS, learning some IDE really well including its debugging abilities, some VCS preferably ‘git’ and a repository site like ‘github’, some frontend framework would be highly recommended (React, Vue …) and I probably forgot a few more … :) but it’s all fun if you’re into learning this stuff!