1. Take care to ensure that you follow platform guidelines
2. Ensure that the view and controller are not tightly coupled
3. Ensure that whatever libraries you want to use have support for all platforms you want to support
4. Pray that you don't need something very platform specific (or need to use Bluetooth, which I am told is a huge pain)
Flutter Desktop seems promising, and at least good enough to create some cross-platform Desktop apps like Rows: [0]
[0] https://blog.rows.com/p/we-built-a-desktop-app
1. Take care to ensure that you follow platform guidelines
2. Ensure that the view and controller are not tightly coupled
3. Ensure that whatever libraries you want to use have support for all platforms you want to support
4. Pray that you don't need something very platform specific (or need to use Bluetooth, which I am told is a huge pain)