The core collection kit includes; The Buffing brush which is great for buffing in powder foundations and also liquid foundations, The contour brush which can be used for bronzer, blush and can be used for highlighter (and setting powder if you're stuck for brushes). The detailer brush is used for detail work such as concealing and I have also used it as a lip brush and it works well for both. The small foundation brush may not be too great for trying to apply a full face of foundation as it is quite small, but can work well as a team with the buffing brush, to get into smaller areas like the sides of your nose ect. It also works well as a concealer brush. I got my kit about 3 months ago now, and have used it everyday since. These are beautiful quality brushes, the bristles are super soft and I have never experienced any fallout, even after many washes. If you are just starting out with make up, I would highly recommend buying this set as a starting point. It is a great addition to anyones make up bag! Five stars from me!
P.S I would also recommend you checking out Pixiwoo on youtube, Sam Chapman (the creator of the brushes) has videos up of the brushes, showing you different ways to use them :)