How to setup another modules with new route files?

I want to create many modules for my applications. After trying very hard i have finally added another module with controller. It is working. But there are some redundancy I want to avoid. And I want to make these modules reusable. That is why I want some suggestions on how I can do that.
It would be very helpful if anyone can help me with writing and adding a new route file in app/Config/Routes.php for a new new module URI mapping. i am not that good with searching that is why I need some direct knowledge about these.