With the Photos App on your iPhone running iOS 13, your photos are automatically sorted into groups based on time and location. Moments are small groups and large groups are Collections. Years is the largest group of photos.
Going backwards takes you back in time and forwards to the current date. Basic navigation is a breeze.
Open the Photos app. Tap the button for the Photos label on bottom-left of your screen to sort through your images by Years, Months, Days or All Photos.
This is a very short tip but it will save you a great deal of time if you know it.
(Works on all iPhones using iOS 13)