I'm pretty new with developing apps but I've made a few apps. When I made those apps I've made them in Xcode however I've heard about Unity. If I have understood it correct you make the game in Unity and then you export it to iOS and Android when you want to publish them correct? Since I've made games in Xcode I'm more familiar with it now and is it possible to make some changes in the Xcode file from the Unity project like changing some artwork, implementing maybe some ads and so on without affecting how it will work? If it I assume it is the same for Android.