The title of the book could be:
"What did my doodles on the back of business cards career taught me?"

Let me quote Chapter 40:

None of this is rocket science.
If I had to condense this entire book into a line or two, it would read something like, "Work hard. Keep at it. Live simply and quietly. Remain humble. Stay positive. Create your own luck. Be nice. Be polite."

And yes, this 159 pages long book - liberally sprinkled with cartoons from Hugh MacLeod - will not deliver some never heard of idea.
Almost everyone who became at least moderately successful told me about the same things.
Life is tough,competition is tough, success is more hard work and keeping at it than talent, and so on.

In one sense this book is nothing more than life lessons wrapped in the life story of Hugh MacLeod, aimed at creative people. "Put the hours in.", "You are responsible for your own experience.", "Keep your day job.", "Dying young is overrated.", "Nobody cares. Do it for yourself.", and such advices.

If you don't like to read about "common sense" advices with some personal experience background, don't buy this book.
If you like to read from successful people, that common sense ideas actually make sense, then go for it.

I personally liked the book a lot. It has delivered on the promise, plus it had a bunch of cartoons.