Once the matter of why we should write is clear, then the what we should write will become immediately apparent.

An effective way to figure it all out.
To figure out life, to figure out people, to figure out business dilemmas, and most important of all, to figure out yourself.

There is something magical about writing down a problem. It is almost as though at the very act of writing what is wrong, you start to discover ways to make it right.
Perhaps the source of this magic lies in the objective perspective that writing afford you.
Even-though you are describing your problem, your challenge, your life, your uncertainty, and your indecision, the fact that you are writing about it, as opposed to mentally pondering it, create a space between you and the problem.
It is within this space that solutions have room to grow.

Writing about events, and circumstances that occurs, help you to clarify exactly what is happening. When we describe life to ourselves only in our mind our imagination tends to feed false or distorted informations about how things are.
When we describe a situation writing it however, we become more factual, more accurate, and certainly more realistic.
Then as we re-read what we have written, we create a new picture in our mind to replace the distorted picture we have been working with. And once we finally things as they are, rather than as we think they are, we can then see our way clear to make them better.

Take the time to capture on paper your problem as it really is.
Writing the problem is only the first step.
The next step is to carefully analyse what you have written.

Here are some of the keys things to look for:

Essentially, you must learn to view your problems like a scientist who puts tiny organisms on a slide.
Examine your circumstances through the lens of the microscope of truth.
To see their real nature, their real parameters, and their real composition.
And number two, as you examine your problems, do as any scientist would do, record your observations.
As you continue to refine your statement of the problem, of the way it really is, you will begin to move closer to the solution.

Be sure to recorde the ultimate conclusion to your dilemma. If it worked well, then it is worth remembering.
And if it didn't work well, as you had hoped it would, then it is even more essential to record the outcome. Lest you should find yourself repeating mistakes, instead of learning rom them.
Mistakes are nothing to be ashamed of, surely most of our personal growth comes as a result of our errors. But what is truly unforgivable is to make the same mistake twice.
Every mistake has his own price tag, but the most costly error anyone can make in an error unlearned and often repeated.

If something didn't work, it may be too late to undo the mistake, but it's never too late to make adjustments and revisions in your thinking.
Better decision making comes from the better thinking habit. And better thinking habits comes from practical experience. Learning both what to do, and what not to do.

Becoming a more effective thinker on paper is a sure way of becoming a better person in practice.

I would suggest writing down problems that you encounter, and recording all the steps you can take, or did take, to solve them. AS well as their eventual outcomes.

My advice is, if you think a suggestion has merit, and that it's worth trying, that you promise yourself that you will do it.

Second function of a journal: Capturing Good Ideas

How many times as we go through the day, do we come across the good idea, a unique quote, an interesting piece of information, or even a significant personal discovery.
And each time we do, we mentally say to ourselves: I must remember that.

The human mind is a remarkable thing, but I also know from experience, that the human memory leave a lot to be desired.

What we do not somehow capture today is lost forever.

There are so many source of insights and inspiration all around us. But obviously, for you to capture the ideas, it is essential, that your journal always be at your side.