diff --git a/docs/lesson03/prepare.html b/docs/lesson03/prepare.html
index 5aa6f18..ebe86df 100644
--- a/docs/lesson03/prepare.html
+++ b/docs/lesson03/prepare.html
@@ -47,18 +47,38 @@ <h2 id="videos">Videos</h2>
     <ul class="videos long">
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-29-of-44-introducing-functions">Introducing Functions</a> <span class="duration">(10 minutes)</span>
+        <div class="video"><iframe allowFullScreen
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Introducing Functions, part 29 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/nrCAxXfRU28?si=DgLu8EjDQMz47UkX">
+        </iframe></div>
         </div></li>
 
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-30-of-44-demo-functions">Demonstration: Functions</a> <span class="duration">(8 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Demo: Functions, part 30 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/C9ZEGqGHXms?si=e_tYqDCgIr89MQ5X">
+        </iframe></div>
         </div></li>
 
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-31-of-44-parameterized-functions">Parameterized Functions</a> <span class="duration">(7 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Function Parameters, part 31 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/sKW-zdYZNX4?si=SZfnZ9_aW7ZKbiLo">
+        </iframe></div>
         </div></li>
 
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-32-of-44-demo-parameterized-functions">Demonstration: Parameterized Functions</a> <span class="duration">(5 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Demo: Parameterized Functions, part 32 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/LtKAXFRtxhQ?si=zD6cA79JQnCVA8pu">
+        </iframe></div>
         </div></li>
     </ul>
 
diff --git a/docs/lesson07/prepare.html b/docs/lesson07/prepare.html
index 61c1b6e..8e9c90b 100644
--- a/docs/lesson07/prepare.html
+++ b/docs/lesson07/prepare.html
@@ -46,11 +46,21 @@ <h2 id="videos">Videos</h2>
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-25-of-44-collections">Lists</a>
         <span class="duration">(12 minutes)</span>
+        <div class="video"><iframe allowFullScreen
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Collections, part 25 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/beA8IsY3mQs?si=MTrHiw9YX3etgUh6">
+        </iframe></div>
         </div></li>
 
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-27-of-44-loops">Loops</a>
         <span class="duration">(6 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Loops, part 27 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/LrOAl8vUFHY?si=Gzvq_L-JyW-6tqVx">
+        </iframe></div>
         </div></li>
     </ul>
 
diff --git a/docs/lesson09/prepare.html b/docs/lesson09/prepare.html
index a154b96..b01d678 100644
--- a/docs/lesson09/prepare.html
+++ b/docs/lesson09/prepare.html
@@ -40,6 +40,39 @@ <h1>09 Prepare: Text Files</h1>
     a file. During this lesson, you will learn how to write Python code
     that reads text from text files.</p>
 
+    <h2 id="videos">Videos</h2>
+    <p>Watch the following three videos from Microsoft about writing
+    Python code to work with files.</p>
+
+    <ul class="videos long">
+        <li><div>
+        <a href="https://learn.microsoft.com/en-us/shows/more-python-for-beginners/working-with-files--more-python-for-beginners-14-of-20">Working with Files</a> <span class="duration">(watch just the first 4 minutes)</span>
+        <div class="video"><iframe allowFullScreen
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Working with Files, part 14 of 20 of More Python for Beginners"
+        src="https://www.youtube.com/embed/QDYIMoA9EOg?start=0&end=240">
+        </iframe></div>
+        </div></li>
+
+        <li><div>
+        <a href="https://learn.microsoft.com/en-us/shows/more-python-for-beginners/using-with-to-automatically-close-resources--more-python-for-beginners-16-of-20">Using <code>with</code> to Automatically Close Resources</a> <span class="duration">(2 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Using with to Automatically Close Resources, part 16 of 20 of More Python for Beginners"
+        src="https://www.youtube.com/embed/vu4QfAhWN7E">
+        </iframe></div>
+        </div></li>
+
+        <li><div>
+        <a href="https://learn.microsoft.com/en-us/shows/more-python-for-beginners/demo-using-with--more-python-for-beginners-17-of-20">Demo: Using <code>with</code></a> <span class="duration">(2 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Demo: Using with, part 17 of 20 of More Python for Beginners"
+        src="https://www.youtube.com/embed/0YMQef6izIo">
+        </iframe></div>
+        </div></li>
+    </ul>
+
     <h2 id="concepts">Concepts</h2>
     <p>Broadly speaking, there are two types of files: text files and
     binary files. A <dfn>text file</dfn> stores words and numbers as
diff --git a/docs/lesson10/prepare.html b/docs/lesson10/prepare.html
index 0c3e391..bb7faab 100644
--- a/docs/lesson10/prepare.html
+++ b/docs/lesson10/prepare.html
@@ -52,10 +52,21 @@ <h2 id="videos">Videos</h2>
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-17-of-44-error-handling">Error Handling Concepts</a>
         <span class="duration">(13 minutes)</span>
+        <div class="video"><iframe allowFullScreen
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Error Handling, part 17 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/HQqqNBZosn8?si=XQ0laa1qKT5cIc2W">
+        </iframe></div>
+        </div></li>
 
         <li><div>
         <a href="https://learn.microsoft.com/en-us/shows/intro-to-python-development/python-for-beginners-18-of-44-demo-error-handling">Error Handling Demonstration</a>
         <span class="duration">(4 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Demo: Error Handling, part 18 of 44 of Python for Beginners"
+        src="https://www.youtube.com/embed/LrRh-V-hYEc?si=e7lGJdL52KHmlFuH">
+        </iframe></div>
         </div></li>
     </ul>
 
diff --git a/docs/lesson11/prepare.html b/docs/lesson11/prepare.html
index 4745444..effd5b0 100644
--- a/docs/lesson11/prepare.html
+++ b/docs/lesson11/prepare.html
@@ -645,6 +645,31 @@ <h2 id="sort_list">Example - Sorting a Compound List</h2>
 </div>
 
     <h2 id="videos">Videos</h2>
+    <p>These two Microsoft videos might help you understand lambda
+    functions more deeply.</p>
+
+    <ul class="videos long">
+        <li><div>
+        <a href="https://learn.microsoft.com/en-us/shows/more-python-for-beginners/lambdas--more-python-for-beginners-4-of-20">Lambda Functions</a>
+        <span class="duration">(5 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Lambdas, part 4 of 20 of More Python for Beginners"
+        src="https://www.youtube.com/embed/NWLoNpQfrRE?si=bunNN3eTOl20zMUL">
+        </iframe></div>
+        </div></li>
+
+        <li><div>
+        <a href="https://learn.microsoft.com/en-us/shows/more-python-for-beginners/demo-lambdas--more-python-for-beginners-5-of-20">Demo: Lambda Functions</a>
+        <span class="duration">(4 minutes)</span>
+        <div class="video"><iframe allowFullScreen loading="lazy"
+        referrerpolicy="strict-origin-when-cross-origin"
+        title="Demo: Lambdas, part 5 of 20 of More Python for Beginners"
+        src="https://www.youtube.com/embed/KIzEJK7HhOw?si=Z4czftIK74oCgYWm">
+        </iframe></div>
+        </div></li>
+    </ul>
+
     <p>If you wish to learn more about functional programming in Python,
     watch these videos by Dan Bader.</p>