Studio still life shooting tutorial

Does it have to be white? Look at this picture you sent, I don't think it's as white as it was taken, but it's like changing the background and directly whitening it with ps. You don't even have a shadow on the picture, even white. I suggest you directly use ps to whiten ~

As for making it warm and soft, you can try to change it to task mode and adjust the ISO value to reduce exposure.