Try to not sit on the armrest or the backrest of the sofa as it may affect it's structure and stability.
Do not keep warm or cold items directly on the furniture surfaces, instead use a hot pad or coaster, do not keep hot items like a pan or baking dish even on a hot pad.
To protect your furniture from fading, avoid keeping your furniture next to windows and other places where it can be exposed to direct sunlight.
Seating foam of the sofa may get softer after a period of time as the foam has a natural tendency to get softer after usage, that doesn't mean it has manufacturing defects.
Cleaning your furniture items regularly will help you maintain them for a long time, make sure that you clean your furniture gently with a soft lightly damp cloth, do not use a rough rag and pressing it hard against the wood & metal as it might lead to minor scratches or colour fading.
In case of a spill on the furniture, never clean with harsh chemicals or other cleaners, we recommend using a professional stain remover, cleaner or service.
To protect your furniture from moisture, avoid placing it in direct contact with damp walls. We recommend wiping the moisture promptly with a dry, soft & lint-free cloth.
Do not iron clothes on the sofa, it may affect the foam as well as the fabric.
Do not drag the sofa on hard floor as well as on soft floor, as there are high chances that the legs will get weak or damaged.

Harmony 1-Seater Fabric Sofa