PuTTY is open source software used as SSH and telnet client. Latest version can be downloaded from https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
Run the installer once the download finishes.
Input the IP address and port number.
A terminal will be opened prompting you for login information.
Note: passwords are hidden
Upon successful login, you have now established an SSH connection.
If you're new to linux, you would require a decent bit of knowledge for controlling and accessing your linux VPS. Here's a list of basic commands that you can learn https://www.tecmint.com/linux-commands-cheat-sheet/