Submitting to categories

Is there any danger in submitting to directories?
I mean there’re list of free and other directories and can I just add my site to them or should I take care of something?

There’s no real danger - just no real benefit (barring a few exceptions).

This sort of activity should be reserved when you’ve exhausted all other methods of establishing a back-link portfolio.

So there’s only sense of adding site to site like DMOZ?

Nope, you don’t have to worry about submitting to directories at all. Just make sure you follow the rules of the directories.

it can become not that great if a directory has some low page rank