Woostify is a free premium WordPress eCommerce theme that never lets you down. Whatever you have on your mind, you can sell it easily with WooCommerce and other astonishing functions for your customers like Wishlist, Coupon, Multiple product images, ... Moreover, its instant set up and demo import are so amazing that it helps you dramatically shorten your time dealing with it.
I believe that the clean, decent and simple design will give your customers a straight point to their impression. You can even build your template by using drag and drop Elementor page builder.
This is a feature-rich theme for any online shop that follows the modern, professional and intuitive design. By using powerful customization and Elementor Page Builder, you can manage and create layout for your own simply without coding.
This is quite complicated compared to other free themes so you may face some difficulties during the installation and set up. Plus, I found some mistakes with the font size as stated above. But I don't think they won't be a big obstacle for you.
If you are a layman, I recommend some help fro professional to use all the features and set it up completely. But if you are a professional user, it's a perfect choice among many other free themes.