StGB means criminal law.

(1) means that using public telecommunication services (eg. public phones, maybe paid public wifi?), public transport or entering an event with the intent not to pay the fee can lead to jail up to one year or a fine, unless there's another law that mandates a bigger punishment.

(2) means that even the attempt is a crime (ie. you don't have to succeed), otherwise them catching you would make you exempt from that law (as long as you paid up).

The first few incidents can usually be settled with the fine set by the transportation authority, both to avoid too much work in the legal system and because you might legitimately forget it every now and then (and that means no intent = not criminal = they'd lose a case based on this law).

After too many occurences they'll claim that you can't forget it that often, which helps build a case in court.