How to Conceal: Product and Tools Overview

Skin Food Salmon Darkcircle Concealer
Since there were some questions recently regarding concealing products and tips, I decided to do a 3-part general guide to Concealing for common problems like spots. uneven tones, and dark circles. 
Part 1: OverviewPart 2: Undereye ConcealingPart 3: Spot Concealing

PART 1: Concealer Overview

General Rule-of-Thumb: Concealer should itself be concealed