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How to delete all files in a current directory starting with a dot?

I use Ubuntu 14.04 and in a terminal I became root with sudo su and I wanted to delete root's trash manually. It deleted everything except for a few files that start with a dot. Like .htaccess etc. So I went to that directory (which is "files") and I ran this command:

rm -rf .*

It did delete those files, BUT I also got an error message that the system couldn't delete "." and ".." What does it mean? Like if I tried to delete the whole directory tree? Like I said, when I was running that command I was in the lowest directory. This one to be exact: /root/.local/share/Trash/files/ I shot down my PC and then turned it on. Everything seems to be normal at first glance. So now I want to ask is what went wrong and if what I did could really cause any serious damage to the system in general? In other words, should I be worried now or everything is OK?