Add references to the interactive lessons and examples

static/docs/command-reference/fetch.md

@@ -120,6 +120,8 @@ pipeline stages, as well as a few Git tags, such as our
 [get started example repo](https://github.com/iterative/example-get-started).
 Then we can see what happens with `dvc fetch` as we switch from tag to tag.
 
+**[`▶ Try examples interactively`](https://katacoda.com/dvc/courses/examples/fetch)**
+
 <details>
 
 ### Click and expand to setup the project

static/docs/get-started/index.md

@@ -24,3 +24,6 @@ motivation and what's happening internally.
 You'll need [Git](https://git-scm.com) to run the commands in this tutorial.
 Also, if DVC is not installed, please follow these [instructions](/doc/install)
 to do so.
+
+▶️ For a quick start you can also
+[try these hands-on interactive lessons](https://katacoda.com/dvc/courses/get-started/initialize).

static/docs/user-guide/dvcignore.md

@@ -46,6 +46,8 @@ The same as for [`.gitignore`](https://git-scm.com/docs/gitignore).
 
 ## Example: Modification of ignored data
 
+**[`▶ Try examples interactively`](https://katacoda.com/dvc/courses/examples/dvcignore)**
+
 Let's see what happens when we modify ignored file.
 
 ```dvc