Don’t just use concealer to hide spots
You may think concealing spots or dark patches means that the job is done, but I’d suggest you complete your base by taking a look at your face and deciding if it could benefit from areas of slightly lighter concealer to lift shadows and brighten the face.
Everyone’s different, but I often find places worth paying attention to include the shadows between the nose and mouth, the corner just under the outside of the mouth where some shadow will often sit, and right at the outer corner of the eye which can be a little red.