Which is best for produce item or theme for live preview hosting on free hosting or using dropbox service
Paid hosting is always the best solution. Free hosting is unreliable and unpredictable. You can use dropbox but paid hosting is the best in the long run. And it’s not so expensive, a few sales of your items here will cover it for a month.
Purchase hosting, HostGator (fast support, better for beginners), GoDaddy (always promotions, cheaper, little difficult for beginners because of non standard cpanel etc.)...and ton of other hosting services but for sure not Dropbox or Free hosting…are you serious?