The more focus points the more flexibility in picking which part of the scene to focus on. They also give the image sensor a better probability in identifying the right area of the scene to focus on in more automatic modes.
With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
When the camera shutter is open for a long time, more light is absorbed by the sensor. You can use this slow shutter speed to produce vivid night time photography, or capture the trajectory of moving objects such as motorway traffic.