Update walkthroughs info

docs/getstarted/educators-and-students.md

@@ -87,7 +87,7 @@ Try out these space-travel themed challenges that introduce you to data science,
 
 Check out these WONDER WOMAN 1984 inspired lessons built to help you write your first lines of Python code. In the first module, learn how to crack a Caesar Cipher code that reveals a secret message with a location. In the second module, create a personality challenge to determine which character you're most like!
 
-Follow along with the [video walkthrough of the fist lesson](https://www.youtube-nocookie.com/embed/VH_mU42lQkQ).
+Follow along with the [video walkthrough of the first lesson](https://www.youtube-nocookie.com/embed/VH_mU42lQkQ).
 
 | Title | Description |
 |-------|-------------|

docs/getstarted/images/tips-and-tricks/open-walkthrough.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bb0de709646ded8ff064b6becdf955f35af98b623f606a0e33226477e2ab8bf5
+size 73777

docs/getstarted/tips-and-tricks.md

@@ -25,6 +25,10 @@ Open the Welcome page from the **Help** > **Welcome** menu or use the **Help: We
 
 ![Welcome page](images/tips-and-tricks/welcome-page.png)
 
+Extensions can also contribute walkthroughs. You can also directly open a walkthrough by using the **Help: Open Walkthrough...** command from the Command Palette (`kb(workbench.action.showCommands)`).
+
+![Open walkthrough command in the Command Palette](images/tips-and-tricks/open-walkthrough.png)
+
 If you are looking to improve your code editing skills, open the **Interactive Editor Playground**. Try out VS Code's [code editing features](/docs/editor/codebasics.md), like multi-cursor editing, [IntelliSense](/docs/editor/intellisense.md), Snippets, [Emmet](/docs/editor/emmet.md), and more.
 
 Open the Welcome page from the **Help** > **Editor Playground** menu or use the **Help: Interactive Editor Playground** command from the Command Palette (`kb(workbench.action.showCommands)`).