This is a good introduction to Dune, but frankly, Dune kinda sucks. I mean, it is very powerful, and works very well, but it's too much of a hassle, especially for beginners. I don't want a language specific build system to require two different files to actually be usable, even on very simple projects… I still use it because it is the de facto standard, but I really preferred ocamlbuild [1], which was actually a tool that just worked without any configuration necessary for simple projects that uses standard tools. Where you would need to write a Makefile and call make, you could just write nothing and call ocamlbuild and it would just work. Dune lost that ability entirely.

[1] https://github.com/ocaml/ocamlbuild/blob/master/manual/manua...