Info on the Closed Alpha
https://www.battlefield.com/news/article/battlefield-5-closed-alpha-all-you-need-to-know
If you get invited, you can tackle Conquest mode or the Grand Operation Fall of Norway. Taking place on the map Arctic Fjord, Fall of Norway lets you experience two of its in-game “days” and play two of the modes that the Grand Operation strings together: Airborne and Breakthrough.
Playing Airborne, you’ll either paradrop down to the battlefield to deal with enemy artillery, or fight to counter this attack if you’re on the other team. In the frantic fights of Breakthrough, you must capture sectors as an attacker or keep the opposition at bay through on-the-fly planning.
As for Conquest – this is the timeless Battlefield classic where two teams use infantry and vehicular combat to seize a majority control of key control points.