Linux

Thanks to Linux, you will be able to manage your own dedicated server or VPS (Virtual Private Server) remotely via a secure SSH connection and overcome the various limitations imposed by web hosts (for example).

Indeed, by installing the different services yourself (Apache, PHP, ... for the web, MySQL for the database, ...), you will no longer be limited for the size of your website's storage, your database, ....
You can also adapt the configuration of the various services (Apache, PHP, MySQL and so on) as you wish without being blocked by the restrictions or the strange configurations of some web hosts.

Finally, you can use Linux in a company to create a file server accessible via NFS or FTP, transform your server into a router, ...