In web page, HTML always begins with <html> and ended with </html> which means of describing a web page. If you write the content like what you have tried in the last post, must be inside of <body> and </body> tag, which means the visible content.
So it will be like this:
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<a href="www.vektanova.com">This is link to Vektanova.com</a>
Try add the <html>, <body>, </body>, and </html> onto your last saved html file (learning.html). Before add those, you need to rename again the learning.html to be learning.txt, so that file will be opened in notepad and you can edit it. After you add those, save it and rename it again to learning.html .