The most important thing is that a Smartphone Camera can’t beat a Digital-SLR!
Some of the most important tips I will share with you all from my own Experience and Knowledge( DO correct me if I am wrong)
First thing First
IMAGE QUALITY - DSLRs Camera gives the best Photo quality, because of high resolution, color depth and dynamic range .
BETTER AUTOFOCUS - Smartphones fails here, and DSLR wins. For example - if you are taking a photo of a bird, the Bird may fly away even before clicking the photo with your Smartphone, but DSLRs set focus very fast so you can take a sharp and crisp picture everytime.
LOW-LIGHT SHOOTS - Because of the Larger Sensor DSLR produce better Pictures in Low-Light situations.
Keeping it Simple here! if you want more information comment below:)
Happy To Help^_^