Most no-code app builders provide a list with templates. These templates are already created and can be downloaded. This list will be searched and you can then search for the appropriate template.
Next, take a look at this template. The template will usually give you an idea about the type of app that you can create. If your app helps people find places to stay, for example, it might include a search function, a list of hotels, a gallery, and a list of reviews.
Much like writing a blog post, the only difference is that you cannot see the code behind your app. You will not be allowed to modify the code. However, just like when writing a blog post, you can change the text, add images and even remove sections of the template.