Vim read-only option
You can start vim with a read-only option. This prevents making accidentally changes in files you don't want to touch.
view /file/to/open
view is actually vim.
Use case
You have opened many similar files and accidentally type :wq in the wrong one. Did you make changes? Which changes you made? When do you notice you edited the wrong file?
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Below is a list of some VIM settings I find useful. You can add them to your .vimrc.
source $VIMRUNTIME/mswin.vim " adds Ctrl-X, Ctrl-C, Ctrl-V; block visual mode is now Ctrl-Q
behave mswin
set autowriteall ...