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Got it, you're looking to create an edutech app with features like video lectures, recordings, and online chat. Here's a simplified example of how you might structure the code for these features using a combination of HTML, CSS, and JavaScript for the front end, and Node.js for the back end. Please note that this is a basic outline and a real app would require more comprehensive code and additional technologies.

1. **Front-end (HTML/CSS/JavaScript):**
   
   ```html
   <!DOCTYPE html>
   <html>
   <head>
       <title>EduTech App</title>
       <link rel="stylesheet" type="text/css" href="styles.css">
   </head>
   <body>
       <div class="video-container">
           <video id="lecture-video" controls>
               <source src="lecture.mp4" type="video/mp4">
               Your browser does not support the video tag.
           </video>
       </div>
       <div class="chat-container">
           <div id="chat-messages"></div>
           <input type="text" id="chat-input" placeholder="Enter your message...">
           <button id="send-button">Send</button>
       </div>
       <script src="app.js"></script>
   </body>
   </html>
   ```

2. **CSS (styles.css):**
   
   ```css
   .video-container {
       width: 70%;
       margin: 0 auto;
   }
   
   .chat-container {
       width: 30%;
       margin: 0 auto;
   }
   ```

3. **JavaScript (app.js):**

   ```javascript
   const chatMessages = document.getElementById("chat-messages");
   const chatInput = document.getElementById("chat-input");
   const sendButton = document.getElementById("send-button");
   const lectureVideo = document.getElementById("lecture-video");
   
   // Simulated chat functionality
   sendButton.addEventListener("click", () => {
       const message = chatInput.value;
       if (message !== "") {
           const newMessage = document.createElement("div");
           newMessage.textContent = message;
           chatMessages.appendChild(newMessage);
           chatInput.value = "";
       }
   });
   
   // Simulated video playback
   lectureVideo.addEventListener("play", () => {
       console.log("Video started playing.");
   });
   ```

4. **Back-end (Node.js - server.js):**

   ```javascript
   const express = require("express");
   const app = express();
   const http = require("http").createServer(app);
   const io = require("socket.io")(http);
   
   app.use(express.static(__dirname));
   
   io.on("connection", (socket) => {
       console.log("A user connected.");
       socket.on("chat message", (msg) => {
           io.emit("chat message", msg);
       });
   });
   
   http.listen(3000, () => {
       console.log("Server listening on port 3000");
   });
   ```