<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h1>hellow world </h1>
<h2>am i mohammad suleman ali</h2>
</body>
</html> explain it

1. `<!DOCTYPE html>`: This declaration at the beginning of the code specifies the document type as HTML. It informs the browser that this is an HTML document and helps ensure proper rendering.

2. `<html lang="en">`: This opening tag marks the start of the HTML document. The `lang="en"` attribute specifies the language of the document, which in this case is English.

3. `<head>`: This section represents the head of the HTML document. It contains meta-information and other elements that are not directly visible on the web page.

4. `<meta charset="UTF-8">`: This meta tag specifies the character encoding for the document, which is UTF-8. UTF-8 supports a wide range of characters and is commonly used for web pages.

5. `<meta name="viewport" content="width=, initial-scale=1.0">`: This meta tag defines the viewport settings for the web page. It helps ensure proper display and scaling on different devices. The `width=` attribute is left empty here, which means the width of the viewport will adjust automatically. The `initial-scale=1.0` attribute sets the initial zoom level to 100%.

6. `<title>Document</title>`: This tag specifies the title of the HTML document, which is displayed in the browser's title bar or tab.

7. `<body>`: This section represents the body of the HTML document. It contains the visible content of the web page.

8. `<h1>hellow world</h1>`: This is a heading element (`<h1>`) that displays the text "hellow world" as the main heading of the web page. The heading elements range from `<h1>` to `<h6>`, with `<h1>` being the highest level.

9. `<h2>am i mohammad suleman ali</h2>`: This is another heading element (`<h2>`) that displays the text "am i mohammad suleman ali" as a secondary heading on the web page. `<h2>` has a lower level of importance compared to `<h1>`.

The overall structure of the HTML document includes the `<html>` element containing the `<head>` and `<body>` sections. The `<head>` section contains meta-information and the `<title>` element, while the `<body>` section contains the visible content of the web page, including the headings (`<h1>` and `<h2>` in this case).

When you open this HTML file in a web browser, you will see the "hellow world" text displayed as the main heading and the "am i mohammad suleman ali" text displayed as a secondary heading on the web page.