Of course they are sold everywhere but I have a HD near me.

I see these multipacks in red, blue or green packaging and am trying to
figure out which one is good for what purpose.

I have a normal home with all kind of spaces: lobby, stairs, hallway,
various rooms, porch, garage, basement, laundry, etc. I would like to
replace every light I can by an energy-saver and would be grateful for
any guidance about the different types, which is good for what.