The WordPress platform has attracted developers who want the competition for a reign of the app or website in their hands and run them independently. If you do not like the existing or the default theme, you can very easily customize your app according to your desired theme based on your choice.
The knowledge of HTML, PHP and/or CSS, helps to achieve this effortlessly. However, while customizing your WordPress theme, you may be tempted to it directly by adding or changing files in the folder of the current theme. This can be problematic as any modification made in this manner will be lost once the theme is updated.
You then have to choose between keeping the theme updated (not updating can risk security) or losing your customizations while updating (all hard work has gone).
In such a situation, the ideal option is to use a child theme for mobile app development, using which you can make any number of changes to the WordPress mobile app without disturbing any of the original theme files.
Read moreSteps for Creating WordPress Mobile App Child Theme