Boulder walls, block retaining walls, paver patios, walkways, and steps, built on a compacted base with drainage behind it, so frost heave and hydrostatic pressure don't undo the work in year two.

Every wall starts with compacted base material and gravel backfill for drainage, not just a row of block stacked on dirt. Every patio gets a proper base and edge restraint so it doesn't heave or spread. That's the difference between something that looks good on install day and something that still looks good in ten years.
Tell us what's going on with your property, and we'll figure out the right fix together.