How to put an image for modeling on the background?

I want to model a cool Katana but I don’t know how to put an image on the background to model.
Could someone explain me plz.

If you want to add an image, go to the Add menu, look for “image” and choose “Background” for which specific image you want to have as a background.

Thank you)))

You can also drag any images from your hardrive directly in blender viewport.