This article looks at the technologies and methods that you should be well familiar with to design a theme.
MyCashflow themes can be fully implemented by using HTML markup and CSS styles.
You can fetch contents from your online store to HTML files by using the theme system'as Interface tags. Tags are MyCashflow's own commands for adding predefined online store components such as product information, buttons, forms, and other user interface elements.
Therefore, implementing a theme does not require any server-side programming language skills or working with databases.
In addition to this guide, you should use HTML/CSS/JS reference materials.
For example, the Mozilla Developer Network is an excellent source of knowledge about web technologies.