In HTML, you can write comments to leave notes for yourself or others. Comments will not be displayed in the browser. Here's how you can write a comment in HTML:

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<!-- This is a comment in HTML -->

You can place comments anywhere in your HTML code, and they can span multiple lines as well:

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<!-- 
This is a multi-line comment 
in HTML 
-->

Feel free to check more about HTML comments here.

In Python, you can add comments by using the # symbol. Anything following the # on that line will be treated as a comment and will not be executed by the program.

Here's an example:

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# This is a single-line comment
print("Hello, World!")  # This prints a message

For multi-line comments, you can use triple quotes (''' or """):

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"""
This is a
multi-line comment
"""
print("Hello again!")

You can read more about comments in Python in the official Python documentation.

To comment on JavaScript, you can use either single-line comments or multi-line comments.

For single-line comments, you can use the double slash // at the beginning of the line. Anything after the // will be treated as a comment and will not be executed as code. Here's an example:

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// This is a single-line comment
console.log("Hello, World!"); // This line of code will be executed

For multi-line comments, you can use /* to start the comment and */ to end it. Everything between the /* and */ will be treated as a comment and will not be executed. Here's an example:

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/*
This is a multi-line comment
console.log("Hello, World!"); // This line of code will not be executed
*/
console.log("Hello, SheCodes!"); // This line of code will be executed

Comments are useful for adding notes, explanations, or temporarily disabling portions of code without actually removing them. They can help you and other developers understand the code better.

To add comments under an article in an HTML file, you can use the HTML comment tag <!-- -->. Anything placed between <!-- and --> will be treated as a comment and will not be displayed on the webpage.

Here's an example of how to add comments under an article in an HTML file:

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<article>
    <h1>My Article</h1>
    <p>This is the content of my article.</p>

    <!-- This is a comment -->
    <!-- Comments can be used to provide additional information or explanations about the code -->

    <p>More content goes here.</p>
</article>

In this example, the two lines enclosed by <!-- and --> are comments and will not be visible on the webpage. Anything outside of the comments will be displayed normally.

Remember that comments in HTML are a good practice for documenting your code and making it easier to understand. They can be helpful for you or other developers who may be working on or maintaining your code in the future.

To make comments in an HTML file, you can use the <!-- --> syntax. Anything you put between these opening and closing tags will be treated as a comment and will not affect the display of your webpage. Here's an example:

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<!-- This is a comment. It will not be displayed on the webpage. -->
<p>This is some text that will be displayed.</p>

In this example, the comment will not be visible on the webpage, but the text inside the <p> tag will be displayed. Comments are useful for leaving notes or explanations in your code that can help you or other developers understand the purpose or function of certain elements.

In HTML, you can create comments using the <!-- --> syntax. Anything written between these comment tags will not be displayed on the web page. Comments are useful for adding notes or reminders within your HTML code.

Example:

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<!-- This is a comment in HTML -->
<p>This is a paragraph.</p>
<!-- <p>This paragraph is commented out and will not be displayed.</p> -->

In the example above, the first p element will be displayed on the web page, while the second p element is commented out and will not be displayed.

To write comments in CSS, you can use the /* comment / syntax. Anything enclosed between / and */ will be treated as a comment and will not affect your CSS code. Comments are useful for adding explanations, notes, or reminders in your code. Here's an example:

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/* This is a CSS comment */
p {
  color: red; /* This sets the color of paragraphs to red */
}

In the above example, the comment is indicated by /* and */. The CSS code inside the comment is not executed by the browser, so it does not affect the styling of the paragraph element. Comments are a great way to make your code more readable and maintainable.

To add comments to HTML code, you can use <!-- -->. Anything in between <!-- and --> is considered a comment and will not be displayed in the browser.

Here is an example:

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<!-- This is a comment -->
<p>This is a paragraph of text.</p>
<!-- <p>This paragraph is commented out and will not display.</p> -->

In the example, the first sentence will be displayed in the browser, but the second sentence will not be displayed because it is commented out. Note that comments are really useful when you want to explain or make notes of your code for you or other collaborators to better understand it.

Comments in CSS are written using /* and */ to denote the beginning and end of the comment block. For example:

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/* This is a comment block in CSS */

When writing code in JavaScript, it is best to follow certain coding conventions. Some conventions to consider include:

*Running code in a logical order (from top to bottom). *Writing functions and variables in the same format and order. *Using indentation to represent different levels of the code. *Using CamelCase for naming functions. *Organizing the code into small blocks separated by blank lines. *Using constant values rather than hard-coded values. *Including comments to explain your code.

For more information, read this Guide to Coding Conventions.