To monitor every metrics about your system, you can Conky which is an higly customizable plugin for Linux Here is few lines about how to install Conky and how to install a custom template with more informations (VPN, Cryptos ...)
Just need to run the following command to install it (type y and enter when prompted)
sudo apt-get install conky-all
My custom Conky template display standard informations about CPU, CGU, Network, Disk and add few informations related to VPN (work only with NordVPN at the moment, and it require NordVPN CLI to be installed and logged in)
First, create / copy a config file to a specific folder in order for conky to use it when starting
cp /etc/conky/conky.conf ~/.conkyrc
To proceed, you can change the conky.conf file, and use mine : you can find my config file here
To customiza, just follow the conky documentation to check all available variables You can also use the exec command to execute shell scripts and display results on your conky desktop widgets
More customization will come in the next few weeks, with for example, the crypto-currency trends !