Photograph everything before you unpack
Every room, every wall, the floors, the appliances, the bathroom fittings and anything already damaged, dated and stored somewhere other than the unit. It protects your deposit at the end and it establishes what was already there if an insurance claim ever turns on the condition of the place.
Report existing problems in writing immediately
A worn water heater, a window that does not close, a stain suggesting a past leak. Reporting them in writing at move-in creates a record that you raised it, which matters if that same item later causes a loss. Verbal reports to a landlord vanish.
The same record serves a contents claim
Photographs taken for the deposit happen to show your belongings in place. That doubles as the inventory that makes a theft or fire claim straightforward rather than a reconstruction from memory. One task, two purposes.