reference: https://sitecorecorner.com/2014/08/27/useful-sitecore-query-string-parameters/
sc_mode – Used to change the display mode of the website. Can have the following values:
normal – normal display – the way the users see the site
edit – page editor mode
preview – preview mode
Example: http://yoursitename.com?sc_mode=preview
sc_lang – Used to change the website language. Can have any value that is defined under /sitecore/system/languages
Example: http://yoursitename.com?sc_lang=fr-FR
sc_itemid – Used to change the current item.
Example: http://yoursitename.com?sc_itemid={12345678-1234-1234-1234-123456789ABC}
sc_site – Used to change the current website.
Example: http://yoursitename.com?sc_site=mywebsite
sc_device – Used to change the device in which the website is displayed. Can be used with the device name or the device id.
Example: http://yoursitename.com?sc_device=mobile
Example: http://yoursitename.com?sc_device={12345678-1234-1234-1234-123456789ABC}
sc_database – Used to change the database from which the content is displayed.
Example: http://yoursitename.com?sc_database=master
And here are some of the debug specific query string parameters.
sc_debug – Used to start/stop the debug mode. Possible values are 0 and 1.
Example: http://yoursitename.com?sc_debug=1
sc_prof – Used to start/stop the Sitecore profiler. Possible values are 0 and 1.
Example: http://yoursitename.com?sc_debug=1&sc_prof=1
sc_trace – Used to start/stop the Sitecore trace. Possible values are 0 and 1.
Example: http://yoursitename.com?sc_debug=1&sc_trace=1
sc_ri – Used to show/hide the rendering information. Possible values are 0 and 1.
Example: http://yoursitename.com?sc_debug=1&sc_ri=1
The default debugger usually starts with all three enabled – http://yoursitename.com?sc_debug=1&sc_prof=1&sc_trace=1&sc_ri=1