In assessing a landlord-tenant relationship, what are the landlord's duties?

How do lease covenants affect a landlord-tenant relationship where one party breaches? How may a landlord waive a covenant prohibiting assignment? If a leasehold is condemned or taken via eminent domain, what is the effect on a tenant's duty to pay rent? If an assignment occurs, what is the relationship between the assignee and the landlord? If a tenant breaches one or more of their duties, what remedies are available to the landlord? If a tenant violates a covenant against assignment or sublease, what remedies are available to the landlord? In a landlord-tenant relationship, who has a duty of restoration when the premises being leased are destroyed due to no fault of either party? In assessing a landlord's tort liability, what six duties does a landlord have to make the premises safe? In assessing a landlord-tenant issue, what is an assignment? In assessing a landlord-tenant relationship, what are the tenant's duties? In assessing a landlord-tenant relationship, what is the result of a tenant's covenant to repair? What are the exceptions to the hold-over doctrine? What constitutes a constructive eviction? What constitutes an actual eviction? What constitutes a partial eviction? What is a landlord's duty to deliver possession? What is a landlord's duty to provide quiet enjoyment? What is a landlord's duty to repair? What is a leasehold estate? What is a periodic tenancy and how does it terminate? What is a retaliatory eviction? What is a sublease? What is a tenancy at sufferance and how does it terminate? What is a tenancy at will and how does it terminate? What is a tenancy for years and how does it terminate? What is a tenant's duty to not use the premises for an illegal purpose? What is a tenant's duty to pay rent, and how does it affect their security deposit? What is a tenant's duty to repair? What is the hold-over doctrine? What is the implied warranty of habitability, and what remedies are available to the tenant if breached? When does a covenant run with the land? When does a tenant cause ameliorative waste? When does a tenant cause permissive waste? When does a tenant cause voluntary waste?