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+ `nix repl` to interactively evaluate Nix expressions. `:p` if output is not full.
+ `nix-instantiate --eval <file>.nix` to evaluate a Nix expression from a file. `--strict`.
+
+Nix is like JSON, but with functions. 
+Recursive attribute sets can reference values declared earlier in the same set. 
+```nix
+rec {
+  one = 1;
+  two = one + 1;
+}
+```
+ 
+A `let` binding is used to assign names to values just as attribute sets, they can then be used in expressions. Let bindings have a local scope.
+
+A `with` allows referencing attributes of attribute sets without referencing the set.
+