C++ : Should I learn GTK+ or GTKMM?

C++ : Should I learn GTK+ or GTKMM?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I have a hidden feature that I promised to tell you about.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Next, enter the letters 'awesome' on your keyboard.
It will change your youtube progress bar into a flashing rainbow.

Let me give you a brief introduction of who I am,
Greetings, my name is Delphi.
I help you answer your questions.
C++ : Should I learn GTK+ or GTKMM?
Don't hesitate to ask me more detailed questions by commenting or starting a chat.
If you have additional information or an answer to contribute, please feel free to comment below.
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GTK+ : C++ GTKMM? or Should I learn