Copy and paste the following code.
<div class="card">
<iframe width="420" height="315" src="https://www.youtube.com/embed/ZxiETzt9icM">
</iframe>
<p>
your name hear
</p>
</div>
Change the value of the SRC tag and the content of the para tag.
Type the following command in the git terminal
git add .
git commit -m "My contribution"
git push
If you get an error
! [rejected] master -> master (fetch first)
Then use
git pull
git push