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I'm not familiar with elisp at present.

I put my local configuration into init-local.el and exclude it in .gitignore.

I use (require 'init-local nil t) in init.el file before, however I think (require 'init-local) could have the same effect when I review my init.el today.

So I have the question : What's the difference of (require 'init-local nil t) and (require 'init-local) ?

;;; update

Thanks @phils and @DoMiNeLa10, after your comment and answer, I understand that it must be (require 'init-local nil t) because the file init-local.el is optional, if I use (require 'init-local) and the file init-local.el is missing I will get the error:

File is missing: Cannot open load file, No such file or directory, init-local

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    C-h f require – phils Sep 4 '17 at 12:13
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    What @phils said - ask Emacs. Also: C-h i, choose Elisp, require takes you to the Elisp manual, node Named Features, which tells you everything about require. Also, C-h r load takes you to the Emacs manual, node Lisp Libraries, which covers loading Lisp libraries in general. – Drew Sep 4 '17 at 12:56
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require takes following arguments:

(require FEATURE &optional FILENAME NOERROR)

The NOERROR argument causes the function to return nil when file with the feature isn't found. Without that argument set to t, you'd get an error.

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