include tutorials at start of homework 2

Author: afeld

hw_2.ipynb

@@ -15,13 +15,24 @@
     "_[General assignment information](https://python-public-policy.afeld.me/en/{{school_slug}}/assignments.html)_"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Tutorials\n",
+    "\n",
+    "- [`merge()`](https://pandas.pydata.org/docs/user_guide/merging.html#merge)\n",
+    "- [How to manipulate textual data](https://pandas.pydata.org/docs/getting_started/intro_tutorials/10_text_data.html)\n",
+    "- [How to create new columns derived from existing columns](https://pandas.pydata.org/docs/getting_started/intro_tutorials/05_add_columns.html)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
     "## Coding\n",
     "\n",
-    "The goal here is to practice [joining datasets through pandas](https://pandas.pydata.org/docs/user_guide/merging.html#merge). Hint: The instructions here are intentionally incomplete."
+    "The goal here is to practice joining datasets through pandas. Hint: The instructions here are intentionally incomplete."
    ]
   },
   {
@@ -155,6 +166,16 @@
     "# your code here"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<details>\n",
+    "<summary><strong>Hint</strong></summary>\n",
+    "Having trouble merging the datasets? Try looking at the unique values in the columns you're trying to merge on.\n",
+    "</details>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -178,11 +199,6 @@
     "1. Do a [`groupby()`](https://pandas.pydata.org/docs/user_guide/groupby.html) on the original dataset.\n",
     "1. Join with the populations by borough.\n",
     "1. Compute the per-capita values as a new column.\n",
-    "</details>\n",
-    "\n",
-    "<details>\n",
-    "<summary><strong>Hint 2</strong></summary>\n",
-    "Having trouble merging the datasets? Try looking at the unique values in the columns you're trying to merge on.\n",
     "</details>"
    ]
   },