# Here we go!
Okay, you've solved the first exercise. Let's take a look what you wrote in `index.html`. Here is a content:
```html
Hello, world!
here is a body
```
This is what we call an HTML document. This is a minimal boilerplate for each HTML document.
One of the most important line is the first line:
```html
```
That's the declaration, which represents the document type, and helps browsers to display web pages correctly. It must only appear once, at the top of the page (before any HTML tags).
After the declaration we have special entities called _tags_, which may have _attributes_ with _values_. We're gonna take a look at this in following exercise.