Sitecake is drag and drop CMS so most of the things can be done via drag and drop.
New content is added by dragging toolbar icons onto the page.
IMPORTANT: Don't click toolbar icons, drag and drop them onto the page.
Existing content element can be clicked and moved. Blue dotted placeholder will appear at the places where it is possible to drop the element.
Several content items can be selected at once. To do this click on the side of of your content, create a lasso selection and select several elements. Move them around or just drop them in the trash can.
Read next: Working with text