I have seen apps using images or some kind of same stuff (my guess), for helping user's to understand how to use their app on startup.
For Example Flipkart etc.
I understand they may be using some kind of images.
what my problem is how can they match images to fit properly over their app on so many wide range of mobile screen densities.
How can i apply the same for my own app
Should i use images (Screenshots)
Or is their any proper way of doing this