I've taken on a patio project where I lay down some bricks over a bed of sand. I've watched quite a few videos on the subject.
https://www.youtube.com/watch?v=rlZ8rAs0rcM
for a walkway, they use rock dust and quarter inch stones as a base, and then a layer of sand. they compacted the sand
https://www.youtube.com/watch?v=elSao6Qc_94
uses road base and then rock dust. no sand.
https://www.youtube.com/watch?v=48pp5pNY7x8
i watched this twice but can't remember much besides this guy being too opinionated and that he uses really heavy machinery.
https://www.youtube.com/watch?v=5bVQfWX8SoI
this is probably the most comprehensive one and the tips here apply best to my needs
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