diff --git a/1_Basics.ipynb b/1_Basics.ipynb
index 587665c32312422df323f0869380d863d573fd73..3bff495a7dbbcaf581a50133a02348bab1f129dd 100644
--- a/1_Basics.ipynb
+++ b/1_Basics.ipynb
@@ -203,7 +203,10 @@
    "id": "cc36688b-c983-43f8-8bdf-9b82aae59909",
    "metadata": {},
    "source": [
-    "It turns out that `struct` is one of Julia’s keywords, and they cannot be used as variable names."
+    "It turns out that `struct` is one of Julia’s keywords, and they cannot be used as variable names. \n",
+    "\n",
+    "- For more Julia's keywords, see [https://docs.julialang.org/en/v1/base/base/#Keywords](https://docs.julialang.org/en/v1/base/base/#Keywords). \n",
+    "- For more details on `Variable`, see [https://docs.julialang.org/en/v1/manual/variables/](https://docs.julialang.org/en/v1/manual/variables/)."
    ]
   },
   {
@@ -294,6 +297,14 @@
     "\"hello! \"^5"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "362f9d04-eff9-4594-aa22-a9c8d601fb1e",
+   "metadata": {},
+   "source": [
+    "For more details: [https://docs.julialang.org/en/v1/manual/strings/](https://docs.julialang.org/en/v1/manual/strings/)."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "61ff8194-669c-4ece-ba31-44e88ed808ac",
@@ -593,7 +604,7 @@
    "id": "b597c363-8066-470e-b1c8-edd00b114317",
    "metadata": {},
    "source": [
-    "For more details: [https://docs.julialang.org/en/v1/manual/control-flow/](https://docs.julialang.org/en/v1/manual/control-flow/)"
+    "For more details: [https://docs.julialang.org/en/v1/manual/control-flow/](https://docs.julialang.org/en/v1/manual/control-flow/)."
    ]
   },
   {
@@ -762,6 +773,14 @@
     "end"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "b8eac9e9-dff9-4b86-88a7-e14f27b7f677",
+   "metadata": {},
+   "source": [
+    "For more detials: [https://docs.julialang.org/en/v1/base/collections/#lib-collections-iteration](https://docs.julialang.org/en/v1/base/collections/#lib-collections-iteration)."
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "990cefae-abfe-4649-8d68-3fac1b1e268b",
@@ -918,7 +937,9 @@
     "  - floor: Largest integer not greater than x.\n",
     "  - ceil: Smallest integer not less than x.\n",
     "  - round: Nearest integer to x.\n",
-    "  - trunc: Integer part of x."
+    "  - trunc: Integer part of x.\n",
+    "\n",
+    "For more details: [https://docs.julialang.org/en/v1/base/math/#Mathematical-Functions](https://docs.julialang.org/en/v1/base/math/#Mathematical-Functions)."
    ]
   },
   {
@@ -1738,19 +1759,11 @@
    "source": [
     "- Schreiben Sie eine Funktion, die einen Satz analysiert. Die Funktion sollte dann die Anzahl der Vokale (sowohl in Groß- als auch in Kleinbuchstaben) im Satz zählen und anzeigen."
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "8de11d46-125a-4648-88ec-23707c2c4b1b",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Julia 1.9.3",
+   "display_name": "Julia 1.9.2",
    "language": "julia",
    "name": "julia-1.9"
   },