From the first chapter:

I. Take care of yourself.

I-1
Get care when you are ill.

This makes a whole lot of sense, of course, but all too often people neglect their health. So it actually makes sense that this be included, and as a first item. After all, if you're sick, you're not much good to anybody!

Here is some information about The Way to Happiness published by Freedom Magazine, a publication of the Church of Scientology.

Perhaps the first non-religious moral code based purely on common sense, The Way to Happiness by L. Ron Hubbard is a booklet containing 21 precepts, or principles, for improving morals in today’s world.

The grass-roots demand for this booklet is worldwide, and the precepts are applied by tens of millions around the planet, by men, women and children from every conceivable station in life — from Moscow police officers to convicts serving life sentences in San Quentin, from schoolchildren in South Africa and Hollywood to heads of state. It applies to any person’s life, anywhere.

From: Freedom Magazine

Click on the link to see more materials written by L. Ron Hubbard