The most efficient way to become very good at something is by focusing on weaknesses but, this is counter-intuitive as most of our intuitions have been trained to 'focus on what you are good at'. This is in my opinion, terrible advice as it does not explain the nuances and caveats and most people will not spend the time in discovery of them.

I'ld like to object to this

Practice should make perfect, perfect in this term means a continuous improvement of result-infinitely-and this takes time and constant hard work, yes i agree that

We all want to feel like we are good at something and this can cause us to limit our capabilities enormously as we start to favor what we are 'good at' over what we need to learn.

But why not say it can help us take on that which we think we are good at to the maximum potential it can be. Look at gold, if gold had been processed halfway because its gold anyway and everyone knows its gold, maybe it wont be as much appreciated as it is now. But look at gold when its been beaten through degrees and degrees of heat, it comes out beautiful, something of value.

Because an eagle has a strong beak does not mean it should peck wood.

What im saying is, it is good for one to diversify and acquire skills, at the end of the day humans can be good at anything they work hard at,but you can only be best at one thing and good at many

I have found through experience that most do not do this however, they are not really interested in being great at something. They are however interested in getting a return on their investment but rarely think about where they are actually investing. This traverses many areas of course but in a world of instant gratification, how does one expect to develop skills of value let alone, find their passions?

I have to admit this is exactly as you have said