There are tons of videos describing how to build concrete block walls. I think I watched most of them before working on my foundation for my old house. Google search "laying concrete block" , "laying brick" or even "concrete slab wall construction" Actually I find the stuff interesting, and can now build house foundations…
To add to this, with block walls you use the above method but add rebar and concrete in the voids for strength, Those take forever to take down with a sledgehammer.