I know it's been pointed out before, but they are actually in order of importance.
Reduce your waste.
What you can't reduce, reuse.
If you can't reuse that, recycle it.
(Of course, what can't be recycled gets tossed.)
We have a friend who is very thrifty and saves everything. I work for a neighbor shipping boxes of books. The guy who saves everything is passing along years worth of packing material to be reused shipping boxes of books. Go figure: what most would have considered a sign of being crazy is just his way of keeping useful things out of landfills, at least a little longer. I'm sure all those packing peanuts and bubble wrap will end up there eventually, but at least they got a second use first.