It is the game that is nearer the Graal of air, sea land operations at same level of detail. The land is not so good like the others but it seems the only game that attempted to give the same importance to the three services.
So expect to deal from submarines to engineers,to night fighters, ASW patrols, carrier operations, night torpedo fight, midget submarine operations, parachutists, logistics and if you play as Japan resource/oil transport for japanese industry. Oh i forgot you still have pilots quality to manage...and don't get too attached to your aces. And you have geography, port size limits what you can supply your ships with, so bring tenders AS, AD, AGP, AKE, naval support. Yamato and other battleships for example can only resupply its main guns in biggest ports. Do you split your carriers in task forces or pack them in one task force? do they operate with cruisers or give it also a slow battleship? do you maximize your CAP to protect the carrier of maximize the escort to protect your dive bombers and torpedo bombers? Weather? Moon phases?