Is there any universal method to unroot Rooted Android Phones without going into technical stuff?
You can watch this video, its easy and simple.
If you have superSU install then open it > Go to settings and click on complete unroot. it will unroot your phone. If you dont have this app, you can install it from playstore.
You can root your phone with the help of Dr.fone for rooting your android. Install this app in your pc and root your phone.
But that is not very trusted. SuperSU is the best option for rooting any android device.