Question: I was gifted a small pine tree of unknown species, around 30 cm tall. I don't know how to take care of it, so with not much fantasy I just moved it into a larger pot, added some soil, and watered it till I saw water in the plant saucer. I do not have any balcony or garden, so I placed it in front of the only window of my studio, that points to west.

Am I doing anything wrong? What should I do further? When should I water it?

[![I also added glasses for size comparison](https://i.stack.imgur.com/t1nSa.jpg)](https://i.stack.imgur.com/t1nSa.jpg)

Answer: 
It is a pine (or more specifically, *Picea abies*, often known as spruce rather than pine, but a member of the Pine family) an old fashioned Christmas tree in fact - it will be okay for the Christmas period if you keep it away from heat sources and make sure it's watered. Unfortunately, though, these trees do not make good houseplants - they need to be outdoors, in the cold over winter. All you can do is keep it in the coolest, brightest spot in your home and maybe find someone to take it who can keep it outside later on.
How much root did it have on it? Rule of thumb is the roots should be at least half the weight of the shoots. If there is less root then you need to reduce the shoots accordingly. With a little spruce like that, you could cut out alternate shoots close to the central trunk, but do not prune back the leader at the top. This is only necessary if the root was small and weak. If it is strong then simply maintain water in the trough at the bottom, making sure that it is being taken up.i.e. the top shouldn't be bone dry.