Where to place them
The basic factor is that they have the same requirements for light and heat.
One of the main reasons they fail to thrive is either lack of light or too much light.
Since the most common indoor plants are originally from the tropics (ferns, ficus, dracaenas…) it is important to know that they like lots of humidity and light.
They must therefore be placed in light areas, but away for direct sources of heat, so as not to burn the leaves.
The best place is near to the window.
The best rooms are the living room, study and kitchen; whilst entrance halls and corridors are not very suitable as they are generally darker areas.
In the kitchen, of course, herbs go well: basil, rosemary, sage and mint which also make the room smell fragrant.