To post multiple HTML files in CodeSandbox, you can create a new sandbox, and then add the additional HTML files as separate files in the project. Here are the steps to do it:

1. Go to the CodeSandbox website: https://codesandbox.io/

2. Click on "Create Sandbox" to start a new project.

3. In the editor, you will see a file tree on the left side. Click on the "+" icon to create a new file.

4. Name the file with the .html extension, for example, "index.html".

5. Repeat step 4 to create additional HTML files. Give them appropriate names such as "about.html", "contact.html", etc.

6. You can now modify each HTML file individually in the editor.

By following these steps, you can have multiple HTML files in your CodeSandbox project and work with them accordingly.

fork in CodeSandbox creates a copy of an existing project that you can modify and experiment with without directly affecting the original project. When you fork a CodeSandbox project, you have your own sandbox environment where you can try out new changes, experiment with different implementations, or use it as a starting point for your own project.

Here is an example of a CodeSandbox project being forked:

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// JavaScript example
// Click the 'Fork' button in the top navbar of a CodeSandbox project to create a copy of the original project.
// Here is an example of a React project being forked: https://codesandbox.io/s/react-starter-fork-yku5v

To learn JavaScript properly, here are a few steps you can take:

1. Start with the basics: Begin by learning JavaScript syntax, including variables, functions, loops, conditions, and operators.

2. Follow a structured course: To get a deep understanding of JavaScript, it's recommended to follow a structured course. Some popular online courses that cover JavaScript in-depth are Codecademy, Udemy, and FreeCodeCamp.

3. Practice, practice, practice: Practice writing code and solving problems on your own, this will help you reinforce what you have learnt.

4. Build Projects: Building different projects motivates you to learn more as it breaks down the learning process to more manageable parts.

5. Get Help: If you have any questions, don't be afraid to ask for help. You can ask in online forums like Stack Overflow, or reach out to a mentor for guidance.

Here is an example of a basic JavaScript program that outputs "Hello, World!" in the console:

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console.log("Hello, World!");

Here are some useful resources to learn JavaScript:

• Codecademy https://www.codecademy.com/learn/introduction-to-javascript
• Udemy https://www.udemy.com/topic/javascript/
• FreeCodeCamp https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/

Sure, what kind of app would you like? Please provide some details and requirements.

Here are a few project ideas to help you fill out your portfolio:

• Create a weather app using JavaScript and an API like OpenWeatherMap.
• Create a simple game such as Memory orTic-tac-toe using HTML, CSS and JavaScript.
• Create a dynamic website using React.
• Create a website showcasing elements of your portfolio such as your projects, experiences and skills using HTML, CSS and JavaScript.

The first steps with coding involve learning a programming language and deciding what you are going to code. Depending on your goals, you can learn a language like JavaScript, HTML, or Python. Here is a helpful guide to choosing a programming language: https://www.w3schools.com/whatis/ Then, you can try following a tutorial or creating your own project.

Getting started with coding is easier than you think! Here are a few steps to get you on your way:

1. Choose a programming language to learn. If you're not sure which language to start with, JavaScript is a good choice.

2. Acquire a coding editor. Visual Studio Code is a popular, open-source code editor that many developers use.

3. Take a few tutorials to learn the fundamentals. Codecademy and Freecodecamp are great free resources that provide comprehensive tutorials to get started with coding.

4. Create a project and practice your skills by writing code.

5. Find a community for support and to stay motivated. Many online coding communities exist to support developers at all stages of learning.

Good luck and happy coding!

You can create a HTML project in VSCode by following these steps:

1. Open VSCode.
2. Select File > New File from the menu to create a new file.
3. Enter index.html in the Save As box.
4. Select File > Save As and save the file to the folder where you want to store the project.
5. Add the HTML boilerplate code to index.html as follows:

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<!DOCTYPE html>
<html>
    <head>
        <title>My HTML Project</title>
    </head>
    <body>

    </body>
</html>

1. Select File > Save to save the changes.
2. Your HTML project is now ready!

Here's a guide from VSCode's documentation for a more in-depth walkthrough: Create and Run a HTML Project in VSCode.

Generally speaking, it is recommended to separate your CSS, JavaScript, and HTML as much as possible. Doing this provides a number of benefits such as modularity, reusability, and a better organizational structure for your project that is easier to manage. Additionally, a clean separation of these components is required by many libraries and frameworks, such as React.

For example, your HTML should contain the code that is necessary to render the page correctly, while your CSS should be reserved for styling your elements. Additionally, JavaScript should be used only within an HTML document to add interactive behavior such as form validation and animations.

You can learn more about structuring your web development projects here.