Here are some tips and suggestions for putting decorations on shop windows:
Suction cups. Useful for hanging small things, they come with hooks for items like lights and ornaments.
Window clings. Made of vinyl and stick easily, they peel off without any mess.
Double-sided tape. Good for light items, make sure it won’t leave a sticky mess.
Window markers. Use them to draw or write on the window; they’re easy to wash off.
Spray snow. Makes windows look frosty, you can also make cool shapes.
String lights. Hang them with suction cup hooks, they’re a great way of outlining the window or making patterns.