My new laptop has been stolen, what now?

The new school year has now started again for everyone after a long summer holiday. For many students, this also means that they will need a laptop or tablet for school for the first time this year. More and more secondary schools nowadays expect their students to purchase a laptop or tablet in addition to school books and take it with them in class. But what if you lose your brand new laptop or if it is stolen. What should you do? And what can thieves actually do with your laptop? And are all documents, e-mails or private data on the laptop still safe?