Help sought with a basic problem-(update-answered myself!)

In building a model with separate parts, i.e. a cube, a cylinder, a sphere…how do you ensure that when adding a new mesh, it is a totally separate object. For example, I create a cube, resize it, and then add a new mesh such as a cone touching it. Then when I want to selet the cube without the cone, I find they are joined as one object, Using P to separate is awkward and rarely seems o achieve what I want. Suggestions?
Many thanks!

OK - I think I have figured it out. You must have unselected all other objects, and you must be ib object mode…

I figured that out while struggling through this model!

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