Stone walkway help - Recommendations?

[DonnaLeMert]

Is there a barrier, landscape fabric or any other under and around the large stones? If so, fill gaps with pea-size washed rock. I googled “stone walkway” and there’s suggestions for different kinds of filler material. We used a concrete mix on a similar type flagstone patio. Worked mostly well, but discovered we would have been better off with a different grade/type of concrete. You can also imbed small rocks in the top layer of concrete.