Sorted:

How to mount a new hard drive or partition on Linux Mint?

What is Linux Mint’s Update Manager?

How to set up a firewall in Linux Mint?

What are the Software Sources of Linux Mint?

How to verify that a file system has been successfully uninstalled in Linux?

How to install and configure MongoDB database on CentOS?

What is the package management tool used by Ubuntu?

How to backup and restore system in CentOS?

How to install and configure Tomcat application server in CentOS?

How to use systemctl to manage system services in CentOS?