:nnoremap <leader>ev :vsplit $MYVIMRC<cr>   " For my Vimrc-file
:nnoremap <leader>eg :vsplit /path/to/file/foobar.txt<cr>   " Random notes
:nnoremap <leader>et :vsplit /path/to/file/AnotherFile.txt<cr>    " Other stuff

/User/myusername/path/one/random_notes.txt
/User/myusername/path/two/which/is/different/project_notes.txt
/User/myusername/path/three/folder/after_work_stuff.txt