I would like to take some good suggestions/advices here because I
guess the garden people are all here.

I am not a garden person myself, I hate lawn care. I did some crazy
things, and probably ruined my backyard, (which is about 33'x33') --
took away all the grass, lay down filters, and pave the yard with 4"
G.A., and on top of the compacted G.A., I put 2" pebbles. I still
leave 3 8'x10'-sqared bare-earth areas, now I am planting some trees
and peony on them. And my house is very close to my neighbors, even
the smallest truck can not pass to the backyard, I did all the above
stuffs with a small cart. If I had known the drawbacks, I would not
have ever done so.

I did these last year, thought it could stop the weeds, but I started
seeing the weeds soon. Now it is the second year, and now more weeds
are poping up the pebbles. Currently I spray salt on the weeds, in
order to kill them.

What would be an easy way to prevent the weeds on the pebbles?

Also if I do not have to remove all the pebble and GA, what can I do
to improve the yard? I wish I could have some simple solution, say how
about put concrete on the yard? I know this is some kind of madness.
But any good ideas?

Thanks a millions.