Nim is a modern, expressive, and efficient programming language designed for ease of use and safety. It is a compiled language that can be used for systems programming, web development, and game development. This beginner's guide will provide an overview of Nim, how to write code in it with an example, and the best applications for it.

Overview of Nim
Nim was created in 2008 by Andreas Rumpf with the goal of creating a language that is easy to learn and use, yet powerful and efficient. Nim has a syntax that is similar to Python, making it easy for developers to learn. It is statically typed, which means that type checking is performed at compile-time, ensuring that the code is correct before it is executed.

One of the key features of Nim is its ability to generate efficient C code, which makes it ideal for systems programming. It also has built-in garbage collection and exception handling, which makes it safer than C or C++. Nim is an open-source language that has a growing community of developers who are constantly improving it.

How to Write Code in Nim
To write code in Nim, you first need to install the Nim compiler. The easiest way to do this is to go to the Nim website and follow the installation instructions. Once you have installed the compiler, you can start writing code.

Here's an example Nim program that prints the Fibonacci sequence:

```
proc fib(n: int): int =
    if n < 2:
        return n
    else:
        return fib(n - 1) + fib(n - 2)

for i in 0..10:
    echo fib(i)
```

This program defines a function called `fib` that calculates the nth Fibonacci number recursively. It then uses a for loop to print the first 10 Fibonacci numbers.

The Best Applications for Nim
Nim is a versatile language that can be used for many different applications. Here are some of the best applications for Nim:

1. Systems Programming - Nim's ability to generate efficient C code makes it ideal for systems programming, such as writing device drivers, operating systems, and embedded systems.

2. Web Development - Nim has a built-in web framework called Jester, which makes it easy to write web applications. Jester is fast and lightweight, and supports features such as templates, URL routing, and middleware.

3. Game Development - Nim has a growing number of game development libraries, such as NimGL and SDL2.nim, which make it possible to write games in Nim. Nim's performance and ease of use make it a great choice for indie game developers.

Conclusion
Nim is a modern and powerful programming language that is easy to learn and use. It is ideal for systems programming, web development, and game development. If you are looking for a language that is safe, efficient, and easy to use, then Nim is definitely worth checking out.