Always pick high-quality wood that is clean and has little bark. It is recommended to use kiln-dried or very dry wood with a maximum humidity of 20%. Drier wood will help limit smoke formation during cooking and is easier to ignite.
Go for a harder type of wood, like beech or ash wood. Softer wood like birch burns down very quickly, meaning you will need more wood. Be cautious with using tropical hardwood, as it generates substantial heat. Using an excessive amount of this type of wood can cause the cooking plate to warp.
Please note: do not use green wood and avoid coniferous species such as eucalyptus, elm or sycamore, as these types of wood can contaminate your food and cause health problems.