Input groups are extended Form Controls. Using input groups you can easily prepend and append text or buttons to the text-based inputs. For example, you can add the $ symbol, @ for a Twitter username, or anything else as required.
Form groups are used to wrap labels and form controls in a div to get optimum spacing between the label and the control.
Therefore, use both form-group and input-group as required. Do wrap your label and input in a form-group tag. If any of your input field required to prepended/appended with text/button, wrap the control with input-group. Below is the example, combining both of them. Hope this helps
Generic input
Money value
$
.00
Username
@
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