the thread of emacs

I want to ask something :)

I am using devuan and I want to ask some questions about
gnu emacs

when I build emacs on my devuan distro
Code:./autogen.sh
./configure \
--without-pop \
--with-mailutils \
--with-xwidgets \
--with-cairo \
--without-compress-install \
--with-native-compilation \
--with-json \
--with-dbus \
--with-gif \
--with-jpeg \
--with-png \
--with-rsvg \
--with-tiff \
--with-webp \
--with-gpm \
--without-libsystemd \
--with-modules \
--with-harfbuzz \
build_alias=x86_64-linux-gnu \
host_alias=x86_64-linux-gnuwill use two shortcuts . emacsclient and emacs in /usr/local/share/applications .

where i will put init.el file ?

which ~/.emacs.d or ~/.config/emacs or ~/.config/emacs.d ?

I want one init.el what using both instances for emacs for now ..