link to Why This Class from slides

Author: afeld

index.md

@@ -26,7 +26,7 @@ Produced and taught by [Aidan Feldman](https://api.afeld.me/). Largely based on
 
 ## Why this class?
 
-There are countless resources out there to learn Python and pandas — books, videos, etc. — and many are free. Relative to other Python/pandas courses, this class:
+There are countless [resources](resources.md) out there to learn Python and pandas — books, videos, etc. — and many are free. Relative to other Python/pandas courses, this class:
 
 - Doesn't expect any prior technical experience
 - Puts the data/code in a public policy context

lecture_0.ipynb

@@ -251,6 +251,19 @@
     "- Will get out of it what you put into it\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "### See also\n",
+    "\n",
+    "[Why this class?](index.md#why-this-class)\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {