display only files starting with . (hidden)

ls -ld .* will do what you want.

find . -type f -name '\.*' -print 

Must work if you want list every hidden file down in the directory hierarchy.

If you want to parse ls output, you must add ^ at beginning of regex and don't use -l option. Using -l causes each line output start with file or folder permission information, not file or folder name. So you should use like this:

ls -Ad | grep '^\.'

Or you can do with printf bash builtin:

printf "%s\n" .*

If you use zsh, you can use:

print -l .*