Typo.

2-ObjectProgramming/4-encapsulation.ipynb

@@ -556,7 +556,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Good practices: the default status of a method should be private and you should use mutators for quantities that might vary\n",
+    "## Good practice: the default status of a method should be private and you should use mutators for quantities that might vary\n",
     "\n",
     "In our `Rectangle4` example, all mutators and accessors were public. It is clearly what is intended here so it's fine, but as a rule you should really put in the public area what is intended to be usable by an end-user of your class. Let's spin another variation of our `Rectangle` class to illustrate this:\n",
     "\n"