Find it hard to focus you could have ADHD

I. Focus: What It Is and How it Works
First things first. What is focus, really? Experts define focus as the act of concentrating your interest or activity on something. That's a somewhat boring definition, but there is an important insight hiding inside that definition.

What is Focus?
In order to concentrate on one thing you must, by default, ignore many other things.

Here's a better way to put it:

Focus can only occur when we have said yes to one option and no to all other options. In other words, elimination is a prerequisite for focus. As Tim Ferriss says, “What you don’t do determines what you can do.”

Of course, focus doesn't require a permanent no, but it does require a present no. You always have the option to do something else later, but in the present moment focus requires that you only do one thing. Focus is the key to productivity because saying no to every other option unlocks your ability to accomplish the one thing that is left.

Now for the important question: What can we do to focus on the things that matter and ignore the things that don't?