
The cooperation campaign is good to play through too.
For a Multiplayer experience, it is recommended to at least own Arma 3 Apex to be able to play with its assets and have access to the Tanoa terrain. If you can afford it too, see also the Arma 3 Tac-Ops Mission Pack for a combat experience from multiple points of view. For a Singleplayer experience, the base campaign, Arma 3 Laws of War and in an other style Arma 3 Contact singleplayer campaigns are considered among the best singleplayer moments.
You do not need anything to enjoy playing Arma 3 (but the base game), but depending on which experience you are after the common recommendations change:
Note that no Creator DLCs (CDLCs) are included in these editions! Content