Update to 4 in STEP and README.md

.github/steps/-step.txt

@@ -1 +1 @@
-3
+4

README.md

@@ -14,39 +14,48 @@ _Organize ideas and collaborate using Markdown, a lightweight language for text
 </header>
 
 <!--
-  <<< Author notes: Step 3 >>>
+  <<< Author notes: Step 4 >>>
   Start this step by acknowledging the previous step.
   Define terms and link to docs.github.com.
 -->
 
-## Step 3: Add a code example
+## Step 4: Make a task list
 
-_Great job adding an image to the file :tada:_
+_Great job adding a code example to the file :partying_face:_
 
-In addition to code blocks, some code blocks should be rendered differently depending on the language, such as JavaScript or command-line text.
+**What is a _task list_?** A task list creates checkboxes to check off. They're very useful for tracking issues and pull requests. If you include a task list in the body of an issue or pull request, you'll see a progress indicator in your issue list. The syntax for task lists is very specific. Be sure to include the spaces where required, or else they won't render.
 
 ### Example
 
-<pre>
 ```
-$ git init
-Initialized empty Git repository in /Users/skills/Projects/recipe-repository/.git/
+- [x] List syntax is required
+- [x] This item is complete
+- [ ] This item is not complete
 ```
-</pre>
 
 #### How it looks
 
-```
-$ git init
-Initialized empty Git repository in /Users/skills/Projects/recipe-repository/.git/
-```
+- [x] List syntax is required
+- [x] This item is complete
+- [ ] This item is not complete
 
-### :keyboard: Activity: Adding a code example
+### :keyboard: Activity: Add a task list
+
+GitHub Actions went ahead and made a branch for you. So you'll need to add to the file we've created in the branch, and we will check your work as you work through this course!
+
+1. Return to your pull request.
+1. Use Markdown to create a task list. Here is an example:
+
+   ```md
+   - [ ] Turn on GitHub Pages
+   - [ ] Outline my portfolio
+   - [ ] Introduce myself to the world
+   ```
+
+   Remember, a task list starts with the syntax `- [ ]` and then the task list item. The formatting is specific!
 
-1. As you did before, edit the file in this pull request.
-1. In the file, add the correct Markdown for a code example of your choice.
 1. Use the **Preview** tab to check your Markdown formatting.
-1. Commit your changes.
+1. Commit the changes to the file.
 1. Wait about 20 seconds then refresh this page (the one you're following instructions from). [GitHub Actions](https://docs.github.com/en/actions) will automatically update to the next step.
 
 <footer>