What things? Did you sign an inventory acknowledging responsibility for those items when you moved in? Have you read the lease plus any other documents you signed?
I am not a landlord but it is very common for them to take pictures just prior to you moving in, then taking the same pictures just after. If the two pictures do not match, that is what would support their claim in court, since it is a very common provision in all leases for the tenant to return things exactly the way they were to begin with.
Also, not my area of expertise, but web search "landlord tenant problems" and see if there is free legal help in your area.

