This one finger tap is the most vital part of taking smartphone pics

Most of the time, hitting the shutter button is enough to take the best shot your phone can take. But it often pays to tap on your subject first. — Florian Schuh/dpa

Just hit the shutter button. The automatic system will fix it.

You're not wrong. Smartphones have never been better at automatically adjusting photo settings to get you lush shots and perfect exposures. Even at night, the latest flagships from Apple and Google will turn on night mode to magically brighten up dark scenes with software.