milk and cheese

After doing a search for milk or cheese i found a lot of good info but still have some questions.
is there i difference between freeze dried milk/cheese and powdered?
If so/not is storing it in a mylar bag with O2 a good way to store it long term?
What is the shelf life?
Not really sure what people mean when they say canned milk? I see things like condensed milk in the baking isle of the grocery store but that is expensive, same for cheese of canned bread, bread i have never seen asked in a few stores and got really weird looks from the the employees. trying to get some diversity in my food preps the rice and beans are good but at this point want to get more variety without wasting .

thanks for any information

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milk and cheese