I need help , actually i have an erpnext with old version (11) running but i need to update it from version 11 to 12 …can i do that and what effect it will do later…
Create one Test Server and do experiment over there.
Make an excel too and note there, what you did for.
Once you get expertise over linux/bench command then play with Live server (take backup before entertain)
I fully follow above rule. 
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sure