Hi, i’m new from blender, I would like to modell tray food tray with rounded edges, can someone help me? thanks
You can make something like that by using subdivision surfaces on a plane, just extrude a few times and scale the edges outwards. It’s easier if you use a mirror modifier, you can even use mirroring on two axes and easily change the corners of the tray. Then adding a solidify modifier makes the whole thing a bit more solid. 
Example: tray.blend (82.5 KB)