diff --git a/content/roadmaps/100-frontend/content/103-javascript/104-concepts.md b/content/roadmaps/100-frontend/content/103-javascript/104-concepts.md
index 6b42bbe26..e52e3eefc 100644
--- a/content/roadmaps/100-frontend/content/103-javascript/104-concepts.md
+++ b/content/roadmaps/100-frontend/content/103-javascript/104-concepts.md
@@ -9,4 +9,5 @@ Learn and understand the concepts such as Hoisting, Event Bubbling, Scope, Proto
 <BadgeLink badgeText='Read' colorScheme="yellow" href='https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/'>Var, Let and Const — What's the difference?</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme="yellow" href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain'>Inheritance and Prototype Chain</BadgeLink>
 <BadgeLink badgeText='Read' colorScheme="yellow" href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode'>JavaScript Strict Mode</BadgeLink>
+<BadgeLink badgeText='Read' href='https://dev.to/lydiahallie/javascript-visualized-event-loop-3dif'>JavaScript Visualized (7 Part Series)</BadgeLink>
 <BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=7Tok22qxPzQ'>DOM vs Shadow DOM vs Virtual DOM</BadgeLink>
diff --git a/content/roadmaps/100-frontend/content/115-testing-your-apps/107-ava.md b/content/roadmaps/100-frontend/content/115-testing-your-apps/107-ava.md
index 6195efe56..f8791fcf0 100644
--- a/content/roadmaps/100-frontend/content/115-testing-your-apps/107-ava.md
+++ b/content/roadmaps/100-frontend/content/115-testing-your-apps/107-ava.md
@@ -1 +1,8 @@
-# Ava
\ No newline at end of file
+# Ava
+
+Ava is a JavaScript test runner. It utilizes the async I/O nature of Node and runs concurrent tests, thereby vastly decreasing your test times.
+
+<ResourceGroupTitle>Free Resources</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Rep' href='https://github.com/avajs/ava'>Official Repository</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.freecodecamp.org/news/testing-your-nodejs-applications-with-ava-js-99e806a226a7/'>Testing your Node.js applications with Ava.js</BadgeLink>
+<BadgeLink colorScheme='purple' badgeText='Watch' href='https://www.youtube.com/watch?v=RxLW6-3dk5A'>AVA Tutorial</BadgeLink>
diff --git a/content/videos.json b/content/videos.json
index bd29c6c15..e325bdb4d 100644
--- a/content/videos.json
+++ b/content/videos.json
@@ -1,4 +1,15 @@
 [
+  {
+    "id": "hash-table-data-structure",
+    "title": "Hash Table Data Structure",
+    "description": "Learn everything you need to know about the hash table data structure",
+    "isPro": false,
+    "youtubeLink": "https://www.youtube.com/watch?v=jalSiaIi8j4",
+    "authorUsername": "kamranahmedse",
+    "duration": "8 minutes",
+    "updatedAt": "2022-02-21T19:59:14.191Z",
+    "createdAt": "2022-02-21T19:59:14.191Z"
+  },
   {
     "id": "queue-data-structure",
     "title": "Queue Data Structure",
diff --git a/content/videos/hash-table-data-structure.md b/content/videos/hash-table-data-structure.md
new file mode 100644
index 000000000..9affef978
--- /dev/null
+++ b/content/videos/hash-table-data-structure.md
@@ -0,0 +1 @@
+<iframe src="https://www.youtube.com/embed/jalSiaIi8j4" title="Hash Table Data Structure" />