Mary pretty much covered...
It's a bunch of layers...
Pick an area you want to have worked over
or a new bed started on... mostly this helps
when you're list of things is reallllllly long
and you time to do them is reallllllllly short..
You take card board... *the bigger the better,
cuts down on ridges or seams the weeds
can crawl thru... and give it a good watering, so the card board is wet... *which your worms, etc love.*
then take layers of brown and green and layer one on top of the other..The cardboard is considered a "brown" the grass clippings which is considered a "green" and then chopped up leaves "brown" and more grass clippings, etc...
I personally don't add a "food" scraps to this style of "composting" as the animals can get right into it, and screw up your layers...
***I leave the food scraps to the enclosed bins***
But then you really need to leave it alone, I might start mine in the fall, leave it over winter, and even the following year...***but I'm slow and have tons of that type of stuff to get rid of, from having two yards, mine and my mothers... so, I need a place I can dump the stuff a few years and or season's in a row.
I tell alot of people to try to resist the urge to use it too soon, as it takes time for the card board and stuff to break down...***one side note,
you do have to watch out for tree
roots, going up and under your "lasgna" and the tree
cause the roots will go anywhere's for a food source...
I also tell people if they really want to garden there, use pots/containers and something of that nature and not dig thru the card board..