I just have been assigned to administer SharePoint
My first assignment is to shorten the url of collections
for example guys want to use
Is there any link for articles covering this issue?
In this case you can create Host Named Site Collections instead of Path based site collections where you can have the desired name for the site collection.
these host named site collections only can be created through power shell as there is no way to create through UI .
refer this Host Named Site Collection in SharePoint 2013 for more info on this .
It looks like they created the sites under Central Administration. If so, you should correct that before you do anything else.
I would start by creating a New Web application and Content Database. You can apply the URL as the host header of "Sales", but you need to be sure the DNS points to your farm for that. Then you can move the site collection to the new web application.
Another alternative mentioned above is the option for Host Named Site Collections. It requires that you get the DNS right and a bit more PowerShell, but may serve you better in the end, depending on your plans.
I think that you could look at the managed paths
You will see that there are at least two path:
Explicit inclusion means that you can create only one site collection with this path. Wildcard inclusion means that you can create so many sites as you wish.
if you would not want to use \sites, you can add you own path. After this you can select this path on site collection creation page.
Please make sure you implement a 'root' site collection as this will leave you unsupported if you don't. Without a root site collection many things break, like InfoPath, Workflows, Visio services as these all expect the root site collection to exist.