Racket is a general-purpose programming language that is designed for both functional and imperative programming paradigms. It is a dialect of Lisp and it is known for its ease of use and flexibility. Racket is widely used in the development of educational software, scripting, and web development. In this guide, we will provide a beginner's introduction to the Racket programming language, including how to write it, an example of a program, and the best applications for it.

How to Write Racket:
Racket is a high-level programming language that is easy to learn and use. It has a simple syntax that makes it easy for beginners to understand. Racket can be written in a number of ways, including using a text editor or an Integrated Development Environment (IDE). Here are the basic steps to writing a simple Racket program:

1. Install Racket: The first step is to download and install Racket on your computer. You can download Racket for free from the official Racket website.

2. Launch Racket: Once you have installed Racket, you can launch the Racket environment. This will give you access to the Racket programming tools, including the Racket REPL (Read-Eval-Print-Loop) and the Racket IDE.

3. Write Code: To write Racket code, you can use a text editor or the Racket IDE. The code should be written using the Racket syntax, which is based on Lisp. Racket programs are usually composed of a series of expressions that are enclosed in parentheses.

4. Run the Program: Once you have written your Racket program, you can run it by using the Racket interpreter or compiler. The interpreter will evaluate the expressions in the program and display the results in the REPL.

Example Racket Program:
Here is an example of a simple Racket program that prints "Hello, World!" to the console:

```
#lang racket
(displayln "Hello, World!")
```

This program uses the `#lang racket` directive to specify that the program is written in Racket. The `displayln` function is used to print the text "Hello, World!" to the console. The `ln` suffix indicates that the function should print a newline character after the text.

Applications of Racket:
Racket has many applications, including web development, scripting, and education. Some of the best applications of Racket include:

1. Web Development: Racket has a built-in web server that makes it easy to develop web applications. The Racket web server is fast and efficient, making it a good choice for developing scalable web applications.

2. Scripting: Racket can be used for scripting tasks, such as automating system administration tasks or processing data. Racket has a number of libraries that make it easy to work with files, directories, and other system resources.

3. Education: Racket is widely used in education because of its simplicity and flexibility. Racket is often used in introductory programming courses because of its simple syntax and functional programming paradigm.

Conclusion:
Racket is a powerful programming language that is easy to learn and use. It is a dialect of Lisp and it is known for its simplicity and flexibility. Racket can be used for a wide range of applications, including web development, scripting, and education. With its simple syntax and powerful features, Racket is a great choice for beginners who are interested in learning programming.