Sorted:

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

What is Linux Mint’s Update Manager?

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

What are the Software Sources of Linux Mint?

How to set up a firewall in Linux Mint?

How to install and configure MongoDB database on CentOS?

How to backup and restore system in CentOS?

What is the package management tool used by Ubuntu?

How to install and configure Tomcat application server in CentOS?

How to use systemctl to manage system services in CentOS?