(1) Tucki's bad behaviors are: staying in Internet cafes all night; I am often late and absent from school when I have no intention to study. His general illegal acts include: asking primary school students for money and stealing from classmates and supermarkets. His criminal acts include: robbery with a knife, causing serious injuries.

(2)① There is no insurmountable gap between general illegal acts and crimes. To prevent illegal crimes, we should start with putting an end to bad behaviors, learn to prevent minor delays, abide by the law, and nip in the bud. Teenagers should learn, know and abide by the law, self-discipline according to law, and learn to protect themselves according to law. ③ Listen to the education of parents and teachers correctly. Make friends carefully, make friends that are conducive to your healthy growth, and so on.