Attribut for vertex color in3. 0

Many attribute (geo. Node editor) items are missing in blender 3.0. I can select only tree of a long list in 2.93. How to upgrade and why to wait programers ? There is no tutorial about. Finally, what the avantage of 3.0? How to put the label Col in an attribute result (attribute color ramp is no more in the add list) ?

add an input to your geonode and change the type in the group pannel

That’s not a constructive sentence. Avoid that please