You can never go wrong with having a focused and disciplined mindset, especially with all the distractions that the modern world has to offer. Teaching your children from as early as possible to be focused will set them on the path to real and sustainable success in all facets of their lives.
One of the hallmarks of very effective and successful people is their ability to be disciplined and focus. Without focus, you will spend your time doing the wrong things, always running out of time, and struggling to complete even the simplest tasks.