If you have just purchased a piano and intend to learn how to play it, here is some advice that you might find helpful.
Get the piano tuned before you start using it for your practice sessions
It is absolutely essential to ensure that you have your new instrument tuned by a piano tuning technician before you begin using it for your practice sessions. You should do this, even if the piano is brand-new, rather than second-hand.
The reason for this is that a piano's tuning can be affected if it is moved to a new environment where the humidity levels and temperature differ significantly to the old environment in which the instrument was stored. As such, even if your piano was tuned before it was delivered to your home, it is very likely that it went out of tune during the journey to your property.
If you use an out-of-tune piano for your practice sessions, you may experience two issues. The first is that the music you perform will probably sound terrible because some or all of the musical notes that you play will be off-key. Secondly, if you learn to play on an untuned piano, you will not learn what each note is supposed to sound like, as when you press down on the piano's keys, the notes that it produces will always be slightly too sharp or too flat. This could hinder your ability to improve your music skills.
Given this, it is essential to have a piano tuning expert tune your instrument prior to using it.
Get lessons from a professional piano teacher
There are a plethora of resources online and in bookshops that can help you to teach yourself how to play the piano. However, it is still a good idea to get at least a few lessons from a professional piano teacher.
If you teach yourself without getting any input from a professional, you could form bad habits, some of which may impede your ability to play music to a high standard. For example, if you adopt the wrong hand position when playing, you could eventually develop carpal tunnel syndrome, as a result of having inadvertently compressed the nerves that lead into your hand.
This condition could make it very difficult for you to continue to play well, as you may find the pain you experience when you move your hands and fingers along the piano keys to be very distracting, so much so that you cannot keep track of the music notes you are supposed to be playing or the time signature you are trying to stick to.
However, if you get lessons from a professional, they will spot any issues with your posture or hand position and help you to correct them before these issues begin to affect your ability to play the piano to a decent standard.