Hi,

01. Your screen shows the mega menu block. These blocks are created by a page builder: https://xtemos.com/docs/woodmart/create-menu-2/

As soon as you create an HTML block you can add images as you usually do in any page. There is the Product categories element, in order to show images, you need to add them into the categories: https://xtemos.com/docs/woodmart/product-category-menu/

02. You can change the font by means of the Advanced typography option, which allows you to choose the item from a drop-down or insert your custom CSS class. Please navigate to the Theme Settings > Typography > Advanced Typography.

Here is the documentation providing more detailed instructions: https://xtemos.com/docs/woodmart/advanced-typography-settings/

03. Product Grid/Carousel element is a flexible tool to present WooCommerce products.
https://xtemos.com/docs-topic/products-element-grid-or-carousel/

Best Regards.