On my last two phones I have been asked what I prefer. When I selected gestures, I had to do a course. Which is better than iOS in every way, because there is

On my last two phones I have been asked what I prefer. When I selected gestures, I had to do a course. Which is better than iOS in every way, because there is just one way to go back and there being no indicator in the app how you should do it. Do I swipe or do I look for a back button?