This simply means you don't have a right to speak your opinions
If your "opinion" contains the wish for the murder of a people or a group of people then you can get problems, yes.
But its not so simple at all....the judges have to walk a fine line to still guarantee Article 5. For example there was the case of a leftist using a sticker "Soldaten sind Mörder!" (Soldiers are killers)
Someone took that to court because he believed that to be a case of "Volksverhetzung", many agreed but the judges didn't and set said leftist free. Again, many in Germany disagreed and thought the judgement wrong, but so it was.
It has to be more than just an opinion, believe it or not! For example if a Muslim would openly ask for the beheading of a teacher that would fall totally under that paragraph.
But that "hole" is actually quite small and must be clearly met.
What would interest me, which of your opinions you wouldn't dare to utter in Germany, or on a german board? Maybe I can help?