The Atlas Superstore map in Modern Warfare Multiplayer does not have the same layout as the Atlas Superstore in Warzone. Don’t get confused on specifics, but your general knowledge of what type of fights work within the Superstore can still help you out.
The Gora and Karst Rivers are mostly a transitionary area, save for their Flood Gates, which can be a great place to take cover. Just be careful about climbing the ladders out of here; if you are planning on doing so, it may be wise to pack a pistol along for self-defense.
Given the verticality of Downtown, use it to your advantage by coordinating team strategies around it. Maybe a teammate can take overwatch on a building and make callouts while the others travel on foot, or each team member takes a section of a building when sweeping for loot.
From the Railyard, you can follow the rail tracks by heading southeast, and travel (ideally by vehicle) throughout the entire map, tracing the railroad, and stopping off at multiple destinations. This rail network can be very helpful when learning the geography of Verdansk.
All Police Stations and Guns and Ammo Stores in Verdansk still have active ammo cache. Interacting with one will refill the ammunition type of the weapons you currently have on you, although this can only be done once per ammo cache.
If you parachute from the Atlas Superstore – especially from the pitched roof – you can land on top of the roof sections in the Parking Lot. Here, you could get some unique high ground against enemies within the lot or that are checking out of the Superstore.
All Fire Stations have solid loot potential, including in their tall towers. These towers are often fantastic sniping perches with solid cover, so if you're looking to take the high ground, they are reliable sources for it.
By way of sheer convenience, the northern border of Verdansk between the Military Base and Quarry may be less travelled than the highway system. If you’re trying to travel between these two places, consider taking the cliff roads to potentially maintain a lower profile.