I wanted to know if there is any contradiction when someone is learning several different instruments?

For example, I am learning to play piano . Would becoming a good piano player in any way hold me back from playing another instrument professionally?

P.S. Sorry i couldn't explain well
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It's good to keep in mind that it takes *a lot* of practice to learn an instrument. You have to dedicate a lot of time and it will take years to become a *good* piano player (same for all the instruments). So, if you want to learn how to play multiple instruments, you will have to practice all of them. If you don't have a lot of time, it will be hard to practice them at the same period of time.

This doesn't mean you cannot. A lot of people practice their skills on multiple instruments. 

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> Would becoming a good piano player in any way hold me back from playing another instrument professionally?
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Of course not. Quite the opposite, in fact! I started with double bass for a few years and then I started playing the piano and the fact that I already knew rhythm, melodies, harmony, theory etc, made it easier to learn the piano. If you already know an instrument, it's going to be easier to learn another one. To oversimplify it, you just have to learn the technique in the new instrument.

So my advice would be to start with the one you want to start with (I guess piano in your case) and then if you have the time, take up another one. *But*, I would also suggest that you take up the second instrument after you have learnt quite decent piano, because otherwise, it'd be quite difficult to learn from scratch two totally new instruments when you don't know anything about music.
The first thing to emphasise is that "professional" and "highly skilled" do not necessarily go hand in hand. The Sex Pistols were professional musicians, but you wouldn't use them as examples of how to play their instruments well!

It's also important to emphasise that *expecting* to become a professional musician when you're just starting is wildly over-optimistic. From all the people who start playing instruments, maybe 1 in 20 stick with it long enough that they can earn a bit of beer money playing in an pub band. Maybe 1 in 1000 are good enough to earn a living from it - and most of them will be working as music teachers. Something like 1 in 100,000 will be good enough to earn a living wage solely from performing.

You certainly will find that different instruments need different techniques. Synth and piano will need different ways of playing and thinking about the sound, for instance. That doesn't make it impossible to learn both, but you do need to remember that they are different instruments, and you can't assume that skills on one will always transfer. Even different examples of the same instrument will need time to learn their specific characteristics - on a piano, for instance, the hammer action can be radically different between different pianos, and it can take a few hours of playing to really get the hang of a new one.