Perhaps you're new to having to use firewood for a log burner or the like. It might be that you'be never had to deal with an quantity of wood at all. Storing and stacking firewood is something that is important to get right. badly stored and stacked firewood can lead to fungus forming, insect infestation and an increase in the moisture levels of your wood. Keeping your wood dry and to a minimum moisture level (ideally less than 20%) will mean your get the most from your increasingly expensive resource.
Can you store firewood on the ground?
There are certainly some fundamentals that might no be obvious to everyone. As a general rule, firewood should always be stored off the ground to allow for proper ventilation. Always stack your wood off the ground itself. This prevents moisture being gather from the ground. The key aspect to consider is air; good air flow is centrally to having and keeping dry fire wood.
What about a garage or shed?
If they are dry you are winning! Otherwise, the airflow needs to be optimised in order to be sure the drying process takes place. Leaving a door open in a shed with logs that are stacked to allow air flow should help - but will take longer than if stacked with an open fronted store.
So should I cover my firewood to protect it from the elements?
It's a good question - if your fire wood is already dry (known as seasoned wood) you might want to cover it with a tarpaulin or weather poof cover during bad weather. It's probably a good idea even if you have a covered log store - they are open fronted to keep good airflow- during bad weather such as snow or prolonged periods of rain.