Check Radio Buttons and Checkboxes by Default i have3 no idea how to start this

HTML-CSS
1

i have not inputed any code cos i dont know what and how to input the code

Your code so far


<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>
  
  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
  
  <p>Things cats love:</p>
  <ul>
    <li>cat nip</li>
    <li>laser pointers</li>
    <li>lasagna</li>
  </ul>
  <p>Top 3 things cats hate:</p>
  <ol>
    <li>flea treatment</li>
    <li>thunder</li>
    <li>other cats</li>
  </ol>
  <form action="/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor"> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality"> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; rv:48.0) Gecko/20100101 Firefox/48.0.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default

2

here you are introduced to the checked attribute, this attribute when added to radio buttons or checkbox buttons will make them checked when the page load

what part of the challenge instructions are not clear?

3

oooo i see i just have to add checked to the radio buttons. i thought i had to input another code for it