This section is not about designing your eventual product, but anything displayable that works for your website. For a service or a platform, you will only need to describe and display your product, but for an app, you’ll have to show appealing demos.
The core tools to work with are:
While the former can be tested for free almost infinitely often, the latter costs. We do recommend proto.io for beginners, as it is easier to use and suffices for building a simple mock.
Proto.io explains their essentials below, but you will find many more tutorials from both proto.io and external users on the web.
This is a whole playlist on sketch 3 with 25 video tutorials. Note that you can build both websites and apps on Sketch. While the best tutorials are on websites, their content can be easily transferred to crafting apps.