Learn HTML by Building a Cat Photo App - Step 1

Tell us what’s happening:
Describe your issue in detail here.
Hello, pls lam a beginner with no idea about a Cat Photo App.
Please where to start

  **Your code so far**
<html>
<body>
  <h1>Hello World</h1>
</body>
</html>

STEP 1

Cat Photo App! ""
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36 Edg/105.0.1343.33

Challenge: Learn HTML by Building a Cat Photo App - Step 1

Link to the challenge:

Hello, welcome to the forum!
For help with step 1 please look here