Why Emacs config file disables Welcome message only if this line places to .emacs but not in .emacs.d/init.el

[znavko]

Hello! I plan to type some russian translations for guix manual sometimes again.

I still have undergraduate level of emacs and have annoying ignorance of how to 
configure emacs.

For example this line can hide "Welcome" frame:
(setq inhibit-startup-screen t)

I placed it into ~/.emacs.d/.init.el where I have placed my po-mode lines and 
they works.
But exactly this line does not work. I have po-mode in emacs but I still have 
"Welcome" window.

I placed this line "(setq inhibit-startup-screen t)" to ~/.emacs and I finally 
got "Welcome" window away.

My next step is russian spell check. Need to have some basics of how to deal 
with this great instrument!

Can you advice some good tutorials for better understanding emacs?

.init.el
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