Never ever put your fingers inside a blender when it is plugged in, If unfortunately blender starts rotating you may lose your finger.

Never put thick and gooey foods such as potatoes, or dough in your blender this will cause the blender to work harder and overheat.

This will just burn out the device and may increase the risk of a fire or electrical hazards.

Never use extremely hard frozen foods in a blender without thawing them first for sometimes, because it can break the blender container, and blades sometimes a few random chunks of fruits present in your smoothie.

If you want to use dried fruits on your dish then don't add them directly to the blender, because it's leathery exterior and sticky insides, it can easily get stuck to the blades and render them useless. 

If you go ahead blending rock-solid ice cubes without following any instructions you may end up breaking the blades or breaking the pitcher.

You should not put any bones from chicken, goat and pork or fish inside a blender because this may dull or break the blade, jam the blender and sometimes damages the container.

You should not use any strong-smelling or spicy foods like garlic, ginger and dried red chilli, or peppers alone inside the blender, because it leaves consistent odour and spice behind them, which easily transfers to the next blending thing.

Don't put extremely hot liquid inside the blender before cooling down for sometimes because the steam from the hot liquids creates enough pressure to blow the lid off the top and may burn anyone nearby.