diff --git a/main.ipynb b/main.ipynb
index 308b323..246605c 100644
--- a/main.ipynb
+++ b/main.ipynb
@@ -14,6 +14,7 @@
    "cell_type": "markdown",
    "id": "b3969792-c3ea-490b-8f5a-463da33ce0c4",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -62,7 +63,7 @@
     "* [styling](https://peps.python.org/pep-0008/).\n",
     "* testing (no link, because testing is quite diverse); not only unit tests; I'm still relatively incompetent at it, so things will be described from quite a limited perspective.\n",
     "\n",
-    "Most sections will eventually include \"***prerequisites:***\" part (things you need to know before looking into this section); things required are mostly found in the official tutorial."
+    "Most sections will eventually include \"_**prerequisites:**_\" part (things you need to know before looking into this section); things required are mostly found in the official tutorial."
    ]
   },
   {
@@ -80,6 +81,7 @@
    "cell_type": "markdown",
    "id": "07390193-fdde-4bee-aec4-f5b3227dea06",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -89,14 +91,14 @@
     "\n",
     "Even a dynamically typed language can sometimes, at least, declare types. Python has built-in support for that via annotations.\n",
     "\n",
-    "_**prerequisites:** [functions](https://docs.python.org/3/tutorial/controlflow.html#defining-functions)*_\n",
+    "_**prerequisites:** [functions](https://docs.python.org/3/tutorial/controlflow.html#defining-functions)_\n",
     "\n",
-    "***also mentioned here:** [`match`](https://docs.python.org/3/tutorial/controlflow.html#match-statements)*"
+    "_**also mentioned here:** [`match`](https://docs.python.org/3/tutorial/controlflow.html#match-statements)_"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 14,
    "id": "5477e321-dc9a-4c9a-a4b6-a2549c0c0d37",
    "metadata": {},
    "outputs": [],
@@ -108,7 +110,6 @@
    "cell_type": "markdown",
    "id": "990298fd-f154-45c7-b9a7-af63ae6e7c4e",
    "metadata": {
-    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -119,6 +120,7 @@
    "cell_type": "markdown",
    "id": "de9d52c9-6df3-4427-b316-587b56347cd4",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -141,6 +143,7 @@
    "cell_type": "markdown",
    "id": "ccde8fee-3003-4842-bec8-8f118e95b17e",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -167,6 +170,7 @@
    "cell_type": "markdown",
    "id": "36c05f51-5422-41c7-a461-7f766c04b088",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -188,6 +192,7 @@
    "cell_type": "markdown",
    "id": "a52cf44c-aa01-40c9-9adc-e838da385b28",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -214,6 +219,7 @@
    "cell_type": "markdown",
    "id": "82158316-a752-4bcf-bd6f-c4cde017096b",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [
@@ -263,7 +269,7 @@
     "# [Data model](https://docs.python.org/3/reference/datamodel.html)\n",
     "https://docs.python.org/3/reference/datamodel.html\n",
     "\n",
-    "***prerequisites:** [classes](https://docs.python.org/3/tutorial/classes.html)*"
+    "_**prerequisites:** [classes](https://docs.python.org/3/tutorial/classes.html)_"
    ]
   },
   {
@@ -279,9 +285,9 @@
     "\n",
     "There are a lot of ways, and directly using `open`+`.write`/`.read` is probably not fit for you task. So I decided not to link one specific external article to this section.\n",
     "\n",
-    "***prerequisites:** variables, [strings](https://docs.python.org/3/tutorial/introduction.html#strings)*\n",
+    "_**prerequisites:** variables, [strings](https://docs.python.org/3/tutorial/introduction.html#strings)_\n",
     "\n",
-    "***also mentioned here:** [`with`](https://peps.python.org/pep-0343/)*"
+    "_**also mentioned here:** [`with`](https://peps.python.org/pep-0343/)_"
    ]
   },
   {
@@ -380,7 +386,9 @@
     "\n",
     "statement itself: https://docs.python.org/3/reference/compound_stmts.html#with  \n",
     "relevant PEP: https://peps.python.org/pep-0343/  \n",
-    "the datamodel it represents: https://docs.python.org/3/reference/datamodel.html#context-managers"
+    "the datamodel it represents: https://docs.python.org/3/reference/datamodel.html#context-managers\n",
+    "\n",
+    "_**recommended before reading:** [classes](https://docs.python.org/3/tutorial/classes.html)_"
    ]
   },
   {
@@ -395,11 +403,11 @@
     "If you do anything with IO, you should probably do it **asynchronously**  \n",
     "https://docs.python.org/3/library/asyncio.html\n",
     "\n",
-    "***prerequisites:** [functions](https://docs.python.org/3/tutorial/controlflow.html#defining-functions)*\n",
+    "_**prerequisites:** [functions](https://docs.python.org/3/tutorial/controlflow.html#defining-functions)_\n",
     "\n",
-    "***recommended before reading:** [classes](https://docs.python.org/3/tutorial/classes.html)*\n",
+    "_**recommended before reading:** [classes](https://docs.python.org/3/tutorial/classes.html)_\n",
     "\n",
-    "***also mentioned here:** [`with`](https://peps.python.org/pep-0343/)*"
+    "_**also mentioned here:** [`with`](https://peps.python.org/pep-0343/)_"
    ]
   },
   {