Question: Can someone tell me, what the href with the "#" means?

```
<a id="logoutLink" href="#">Logout</a>

```

Answer: 
It means nothing... ;) Normally we use `#something` to create anchor to some element. If your URL ends with `...#comments` then your browser will automatiacly jump (scroll the page) to element with `id="comments"`.

`href="#"` is often used to create a link that leads to nowhere.
The hash symbol (i.e., `<a id="logoutLink" href="#">Logout</a>`) is a placeholder, so that you can preview the "Logout" link in a browser as you develop your page. Eventually, the hash symbol will be replaced with a real URL.