Choose a place before choosing a plant
Look at the space and ask about care before filling the windowsill.

In a shop, it is easy to picture a plant in almost any corner. At home, that corner may be far from daylight or directly in a walkway. Choosing the place first makes the decision more considered.
Observe it for several days
Note whether the spot receives direct sun, indirect daylight, or little light. Check whether it sits beside a draft or equipment that changes the immediate conditions. Take a photo of the space when asking for advice at a nursery.
Ask about the needs of the specific species, rather than “an indoor plant” in general. If children or animals share the home, check suitability with a competent source before buying.
Consider the actual care
Can you reach it comfortably for watering and cleaning? Do you have a container that catches water without damaging the surface? Avoid placing pots where they could fall or block a needed window.
Do not buy several plants with different needs while you are still establishing a routine. Starting with a few makes it easier to observe what works.
Leave room for change
Decoration can move. If a location proves awkward, reconsider both the room's use and the plant's needs.
A plant does not need to fill a gap in a photograph. It needs to live in the space you actually have.