refactor classes, add private, minor fixes

Author: iliakan

1-js/07-object-oriented-programming/04-function-prototype/function-prototype-constructor.png

@@ -3,7 +3,9 @@
 
 As we know, objects can store properties.
 
-Till now, a property was a simple "key-value" pair to us. But an object property is actually a more complex and tunable thing.
+Till now, a property was a simple "key-value" pair to us. But an object property is actually a more flexible and powerful thing.
+
+In this chapter we'll study additional configuration options, and in the next we'll see how to invisibly turn them into getter/setter functions.
 
 ## Property flags
 

1-js/07-object-oriented-programming/04-function-prototype/[email protected]

@@ -0,0 +1,3 @@
+# Object properties configuration
+
+In this section we return to objects and study their properties even more in-depth.