Access Specific Editing Tools in Photos
Though not an official iOS tip, so many of us use iPad or iPhone for photo taking and then import and edit on a Mac I thought this "tip" would be very helpful.
The editing view in Photos (on your Mac) presents several tools: Enhance, Rotate, Crop, Filters, Adjust, and Retouch. Of these, the Adjust tool gives you the most specific controls for changing lighting and color. Initially, though, the Adjust tools include just single sliders for Light, Color, and Black & White. You can Bring up editing tools that are normally hidden.
To access controls that are more specific, click the down-pointing arrow that appears when you move the mouse pointer over the top-right edge of a slider. That action exposes the components of each adjustment, such as Exposure, Contrast, Highlights, Shadows, and more.
Even more adjustments are available if you know where to find them. Click the Add button to reveal a pop-up menu of other controls, such as Vignette, White Balance, Histogram, and Levels.