diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eccdbe5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+social-security.txt
+private-directory/
\ No newline at end of file
diff --git a/homework-example.ipynb b/.ipynb_checkpoints/Challenge 3-checkpoint.ipynb
similarity index 70%
rename from homework-example.ipynb
rename to .ipynb_checkpoints/Challenge 3-checkpoint.ipynb
index 2fd6442..363fcab 100644
--- a/homework-example.ipynb
+++ b/.ipynb_checkpoints/Challenge 3-checkpoint.ipynb	
@@ -2,5 +2,5 @@
  "cells": [],
  "metadata": {},
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 5
 }
diff --git a/.ipynb_checkpoints/Practice-Git-Skills-checkpoint.ipynb b/.ipynb_checkpoints/Practice-Git-Skills-checkpoint.ipynb
new file mode 100644
index 0000000..87dffb1
--- /dev/null
+++ b/.ipynb_checkpoints/Practice-Git-Skills-checkpoint.ipynb
@@ -0,0 +1,44 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge\n",
+    "\n",
+    "This challenge consist to:\n",
+    "1. Check git configuration settings\n",
+    "2. Make changes to files (Make changes to files, Check the status of changed file, Add and comit changed files, and push changes to GitHub.com)\n",
+    "3. Add new file to the repo and view the history of changes"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/Challenge 3.ipynb b/Challenge 3.ipynb
new file mode 100644
index 0000000..363fcab
--- /dev/null
+++ b/Challenge 3.ipynb	
@@ -0,0 +1,6 @@
+{
+ "cells": [],
+ "metadata": {},
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/Challenge-3.ipynb b/Challenge-3.ipynb
new file mode 100644
index 0000000..eb5b214
--- /dev/null
+++ b/Challenge-3.ipynb
@@ -0,0 +1,44 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "17f40d20",
+   "metadata": {},
+   "source": [
+    "## Challenge 3\n",
+    "\n",
+    "* Add a new file to the repo, commit the change and push it to github.com. Check to see that it’s there.\n",
+    "* Use git log to view the history of changes that you’ve made."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "adf62a74",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/Practice-Git-Skills.ipynb b/Practice-Git-Skills.ipynb
new file mode 100644
index 0000000..87dffb1
--- /dev/null
+++ b/Practice-Git-Skills.ipynb
@@ -0,0 +1,44 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge\n",
+    "\n",
+    "This challenge consist to:\n",
+    "1. Check git configuration settings\n",
+    "2. Make changes to files (Make changes to files, Check the status of changed file, Add and comit changed files, and push changes to GitHub.com)\n",
+    "3. Add new file to the repo and view the history of changes"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/README.md b/README.md
index 8956487..f40190b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,13 @@
-# A Practice Homework GitHub Repository - Intro to Earth Data Science Textbook Demo
+# A Practice Homework GitHub Repository - Intro to Earth Data Science Textbook Demo.
 
-This repository is a demo repository that you can use to practice your GitHub and git skills while working
+This repository is a demo repository that you can use to practice your GitHub and git skills while working.
 through the online lessons in the [introduction to earth data science textbook on earthdatascience.org](https://www.earthdatascience.org/courses/intro-to-earth-data-science/git-github/version-control/). We will not merge any pull requests here but you can practice opening and closing them here if you want!
 
 Here is some more text.
+
+I add text to see how this file can change.
+Second Changes for testing Pull request.
+
+Additional changes, also for gitHub training. These are made for testing reverse pull request.
+
+Chnages can be made in the file