Making various meshes only one ?

HI !!!

I have 3 different objects in my .blend file, each independent from the others (when I right-click on one in object mode, a pink line surrounding only that object appears ). What I’d like to do is to make all the 3 objects only one (when clicking the same object, I want the pink line surrounding not only one, but ALL of the objects). How can I do that ??

Select all the objects you want to join while holding down shift, then ctrl-j will make them into one object.

Select all the meshes in object mode and ctrl-j

Thank You Very Much !!!:d