Turf preparation and laying.
The shaping of the ground or Turf Preparation is vital to get the surface water to go where you want it to go and gives the finished turf area a nice flat finish.
Laying of turf can be easy if your preparation is good and most importantly use good quality under turf soil mix.
All good garden beds need to be layered when planting out. Low ground covers in the front, shrubs in the middle and higher tees at the back, this gives you a layered look and feel when looking at the garden and feature trees set areas off especially next to a pool or deck.
Always consult a professional or your local nursery can help.