diff --git a/content/lessons/ffmpeg-useful-techniques/index.md b/content/lessons/ffmpeg-useful-techniques/index.md
index bb1728d9d..b7f37af95 100644
--- a/content/lessons/ffmpeg-useful-techniques/index.md
+++ b/content/lessons/ffmpeg-useful-techniques/index.md
@@ -54,7 +54,7 @@ The `scale` filter resizes the video to a width of 320 pixels, while maintaining
 
 The `split` filter splits the video stream into two branches, one to generate the palette and the other to apply it.
 
-The [palettegen](https://ffmpeg.org/ffmpeg-filters.html#palettegen-1) filter creates a color palette based on the input video and and outputs the palette as a video stream, which is passed to the paletteuse filter along with the original video stream.  
+The [palettegen](https://ffmpeg.org/ffmpeg-filters.html#palettegen-1) filter creates a color palette based on the input video and outputs the palette as a video stream, which is passed to the paletteuse filter along with the original video stream.  
 
 Additional ideas for Gif optimization are discussed here by [Giphy Engineering](https://engineering.giphy.com/how-to-make-gifs-with-ffmpeg/). 
 
@@ -97,4 +97,4 @@ exports.convertVideo = functions.https.onRequest((req, res) => {
     })
     .run();
 });
-```
\ No newline at end of file
+```
diff --git a/content/lessons/react-firebase-chat-app-tutorial/index.md b/content/lessons/react-firebase-chat-app-tutorial/index.md
index 7b0635288..1297bd8f5 100644
--- a/content/lessons/react-firebase-chat-app-tutorial/index.md
+++ b/content/lessons/react-firebase-chat-app-tutorial/index.md
@@ -37,7 +37,7 @@ The following tutorial demonstrates how to build a simple group chat app with Re
 
 ### Firebase Project
 
-Create a free [Firebase](https://firebase.google.com/) project. Make sure to enable Google SignIn and and activate Cloud Firestore. 
+Create a free [Firebase](https://firebase.google.com/) project. Make sure to enable Google SignIn and activate Cloud Firestore. 
 
 ### Create a React App