Absolutely! A Linux virtual server offers a ton of flexibility for what you can install. Just like a physical server, you can set it up for web hosting with software like Apache or Nginx, create a mail server with Postfix, or develop applications with tools like Python and Java. There are also options for databases like MySQL, security firewalls, and even desktop environments if you need a graphical interface. Really, the possibilities depend on your specific needs!

Changing the SSH port can add a layer of security by making it less vulnerable to automated attacks that target the default port 22. It's like having a secondary lock on your house - it won't stop a determined thief, but it deters casual break-in attempts. However, for maximum security, you should also consider using strong passwords, SSH key authentication, and keeping your server software up to date.

The best program for your Linux VPS depends on what you want to do! For secure command line access and administration, PuTTY for Windows and the built-in terminal for Linux/Mac are excellent free options. If you need a graphical desktop experience, consider tools like Remmina or TigerVNC. Let me know if you want to dive deeper into any of these!