When you move out, make sure your place is reasonably clean and not damaged.
If you think your landlord might try to make you pay for repairs or cleaning, make sure you have proof that you left your apartment in good shape. You could do this by taking pictures of your place when you move out. Or, you could have someone look at your place just before you leave.
Your landlord could sue you if your place is damaged. And, your landlord will probably not give you a good reference when you are looking for a new place to live.
If you paid a security deposit when your tenancy started, your landlord is not allowed to keep it to pay for damage. Your landlord can use your deposit only to cover the rent for the last rental period before your tenancy ends. That is why security deposits are also called last month's rent deposits or sometimes LMR.