I was taught by a stone mason how to build the different kinds of walls, dry stone walls, cement walls, and lime walls, the hardest is the lime walls. I picked it up fairly quick as I liked to build things and walls of stone were a puzzle that suited me. I've done a few posts on walls but can only find this one for you: https://steemit.com/stone/@wales/how-to-build-a-dry-stone-wall-in-the-garden