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.
If points to an anchor on the page. In this case the anchor is just default. You could have multiple anchors on the page 

<a name="anchor1"></a>
<a name="anchor2"></a>
<a name="anchor3"></a>

and link to them as

<a href="#anchor1">link 1</a>
<a href="#anchor2">link 2</a>
<a href="#anchor3">link 3</a>