'dev site' = development site = a site that you develop what you want on your site without impacting the live site.
It's never advisable to add untested components to a live site and try to configure them.
E.g., you want a shopping cart but you are not sure what to choose, others want galleries(etc.), but don't know which component will fit their needs exactly.
So, you create a development site by making a copy of your current site.
We usually suggest using Akeeba to do so.
www.rockettheme.com/forum/index.php?f=15&t=61746&rb_v=viewtopic
Then you create a dev site with the back up on local host or a sub folder of your host (if you are creating the dev site on your host, remember you will need a new DB).
www.rockettheme.com/forum/index.php?f=15&t=61747&rb_v=viewtopic
www.rockettheme.com/forum/index.php?f=15&t=61746&rb_v=viewtopic
You can test and develop on the dev site and when you are ready to go, apply the changes to the live site.
The best thing about a dev site is you can make changes and mistakes with impunity, i.e., experiment and learn w/o taking the live site down if you make a mistake...
Will I be limited to the payment gateway I can use. I noticed that it only mentioned paypal and google gateways. My payment gateway will be supplied from Sage UK. So will this mean I will not be able to use Quickcart.?
Yes, that is correct, if RQC doesn't meet you exact needs "as is" then you should choose another cart solution, VM or otherwise.
www.rockettheme.com/forum/index.php?f=24...74779&rb_v=viewtopic