First, it is crucial that your firewood is stored in a dry location, off the ground with adequate airflow to ensure proper drying and to prevent rot.
A common mistake is storing wood on the ground with a covering such as a tarp this often leads to the spread of mould and decay as it keeps in moisture and condensation coming from the drying logs.
The ideal way to keep firewood dry and dry the fastest is to store it in a firewood shed or other structure that has good air circulation. Usually a structure with a roof and 3 sides, with the sides not going all the way to the ground to let air underneath. A good way to keep the firewood off the ground is to use pallets, as this also helps air circulation.