I am working for my stakeholder and required to hide left navigation ( Mainly required ), in addition to hide global Navigation also.
Much appreciated if you somebody can suggest.
There are different ways to do that for SharePoint version.
Lot of links available if you do Google on this.
Refer this links for your indefinite question:
http://www.brightworksupport.com/hide-the-quick-launch-in-sharepoin…
or this
http://sharepointpromag.com/sharepoint-administration/four-ways-add…
Hope this helps!