In the video at 2:57 is shown the list of types for the Shader Graph’s property types. It simply shows Color
:
There have been some changes in later versions of Shader Graph.
I have SG 14.0.6 installed in my project (currently with Unity 2022.2.12f1).
In here there are two Color
entries and you want to use the second one I have highlighted in my screenshot below: