The piano is a wonderful instrument and needs to be treated with the greatest respect. It requires regular tuning depending of course, how often it is played. The temperature of the room is important; not too warm or on a radiator so that you dry out the instrument and loosen the tuning pins. [This would be obvious if the piano is out of tune quicker than usual and the pitch begins to drop]. If it's too humid, it can cause sticking notes and squeaks and the wood will swell. Generally, your piano will go flat in the summer and sharp in the winter.
Make sure you have a tuner at least once a year to maintain your instrument, just like you would service a car and put it through an MOT. Then further work may be spotted and fixed by a technician before there is too much deterioration.
I hope you have as much pleasure as I have in discovering the world of the pianoforte! I am a pianist, a composer and sometimes teach.I have spent my life on this wonderful instrument. Enjoy!