The program had a uniform subject that was geared to specific life situations: the reporter Willi Weitzel tried to give young viewers insights into various topics and professions, for example police officer, train driver, fisherman, soldier, journalist, butcher, farmer, emergency doctor or mayor.

the reporter Willi Weitzel spent the night on 9 November 2003 with five homeless people at the Neptunbrunnen in the Alter Botanischer Garten in Munich.

[1][2] In June 2020, a compilation of several short excerpts from the program was uploaded to a YouTube channel under the title "Willi wills wissen Clips ohne Kontext".

has been broadcast as a three to four-minute gap filler, in which Willi answers questions in a studio that children have asked him by letter or e-mail.

In 2008 Weitzel shot the film Willi und die Wunder dieser Welt in Australia, Algeria, Tokyo, the Canadian Arctic and in Germany.