Importing source code changes

If we add a feature using source code in an OS(say Linux), do we have to modify it for other OS(Windows, MAC, mobile, etc) too?

Also a small guide may be welcome for code modification like “Hello Program”.

Normally if you add it for desktop, it will work on Windows, Linux and macOS. If you add it for mobile, it will work on iOS and Android. For some features, like sync or search, if you make a change it will work on all OSes.

In general, you don’t have to get your code to work on everything. Many contributors for example add desktop-only features.

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So I have to focus on one OS and that will be “linux” due to its “code friendly” nature. There are many features missing from mobile version, how can we come in handy there.