When you right click on the Desktop or inside a folder on Linux Mint Cinnamon,you will see the Nemo context menu. This menu contains shortcuts to actions.
The action scripts can be found in the following directory
/usr/share/nemo/actions
Inside the /usr/share/nemo/actions/ folder you will find a sample action file sample.nemo_action You can use this to create your own custom action
Open the sample action file in your own text editor. Mint uses xed as the default text ediitor, but you might want to use Geany or another text editor depending on what packages you have installed in your own Linux Distribtion
You can create all sorts of action scripts, for example right click for System Info or a script that calls a bash script to back up your .thunderbird folder.