At the beginning, each of the platforms had a very different style. In the recent years, both the platforms are tending toward a common and simpler style, with flat elements and minimalistic interfaces. However, there are small differences that we can apply as minor design adjustments if we want our experience to be more native for each platform user.
It is important to read and understand the style guide of each of the platforms. In Android, we found the design guide Material Design (https://material.io/guidelines/), while Apple has iOS Human Interface Guidelines (https://developer.apple.com/ios/human-interface-guidelines/overview/design-principles/). Both offer solutions to general problems of content organization and interface design. We have to look for a balance between the visual identity of our application and the application of style guides...