indentation based on a file type

i found solutions online on how to do indentation based on a filetype
however none of them worked except the last one. i would really
appreciate if someone could explain to me what was i doing wrong.

here are the solutions that didn't work
my .vimrc contains
set shiftwidth=2
set tabstop=2

solution1:

~/.vim/ftdetect/mine.vim
setlocal shiftwidth=4
setlocal tabstop=4

~/.vimrc
au BufRead,BufNewFile *.mine set filetype=mine

solution2:

~/.vim/after/ftdetect/mine.vim
setlocal shiftwidth=4
setlocal tabstop=4

au BufRead,BufNewFile *.mine set filetype=mine

solution3:
autocmd FileType mine setlocal shiftwidth=4 tabstop=4

the following solution worked
Solution 4:
~/.vim/after/ftplugin/mine.vim
setlocal shiftwidth=4
setlocal tabstop=4

~/.vimrc
au BufRead,BufNewFile *.mine set filetype=mine

any help is appreciated.

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