If I use Apple 12W USB Power Adapter will my iPhone SE(2nd generation) mobile will get heated than expected? Please suggest.
If I use Apple 12W USB Power Adapter will my iPhone SE(2nd generation) mobile will get heated than expected? Please suggest.
No. You can use the 12W or even larger power adapters. The phone won't draw more power than it is deigned to use.
Also see the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.