Elgato Stream Deck is easy to setup and use.
This article goes over the Custom Actions that are available for use with files and applications in Windows or macOS.
System Action - Website
Website lets you open a website in default web browser for your OS.
When you create this Action, enter the Web Address (URL) or File Address (URI) that you wish to visit.
System Action - Hotkey Switch
Hotkey Switch lets you choose a special Hotkey, and also toggle it on and off.
The Hotkey may be associated with a command in an application or your OS.
Hotkey Switch works best with one Hotkey that has two states. For example, one Hotkey that starts and stops a certain activity using the same command.
If your Hotkey involves holding down more than one key at the same time, then you can enter one key at a time, to ensure that the Hotkey is not invoked accidentally at the time of creation.
For example, Control-R may Start Recording or Stop Recording. To make sure you don't Stop Recording accidentally, try this when creating your Hotkey:
1) Press Control first, then let go of that key
2) Press R second, and let go of that key
Now, your Hotkey will be Control-R.
System Action - Hotkey
Hotkey lets you assign a special Hotkey. It may be associated with a command in an application or your OS.
Once you choose this Hotkey, it will be immediately activated.
If your Hotkey involves holding down more than one key at the same time, then you can enter one key at a time, to ensure that the Hotkey is not invoked accidentally at the time of creation.
For example, Control-Q may Quit a program. To make sure you don't Quit something accidentally, try this when creating your Hotkey:
1) Press Control first, then let go of that key
2) Press Q second, and let go of that key
Now, your Hotkey will be Control-Q.
This video goes into more depth about Hotkey creation:
System Action - Open
Open lets you open an Application or File in your OS.
When you create this Action, select the Application or File that you wish to open.
If you choose to open a File, the Application that your OS associates with that File will also launch. That may be a different Application than the one that created the File.
Please Note: If you want to open a Shell Script:
1) Create a ".sh" file containing the script. Make sure the script has the executable flag set.
2) Use the Open action in Stream Deck to choose the desired ".sh" file
System Action - Multimedia
Multimedia lets you control the default media player in your OS.
When you create this Action, select the specific command you wish to invoke:
Previous Track
Play or Pause
Next Track
Stop
Mute
Increase Volume
Decrease Volume
Each of these commands will have a different icon associated with it.
If you like, you can make a folder in Stream Deck that contains many Actions - each one selecting a different Multimedia command. That way you'll have easy access to a full set of commands from one interface.