And speaking of not selling to everyone, don’t try to create products that are trying to speak to everyone. Don’t be afraid to get specific. For example, I’m no longer buying “how to make money blogging” courses that are meant to include beginners. Why? Because I can count on 75% of the content, if not more, to be about things I’ve already done – buying a domain, setting up hosting, setting up this, that and the other thing. I’m spending money on things specifically created for people at my stage of the game. And guess what? That creates a lot of opportunity for you in creating additional courses! You can create one for the beginner, intermediate and advanced user. That's a lot of income potential.

I’ve been writing about this since around 2006 or 2007 and I have a monthly article about “alternative income”, which is what I consider blogging. You could say it’s another term for “50% passive.” No one would confuse it with collecting dividends from a dividend ETF, but at the same time, you can take a week off and still earn a certain percentage or baseline of what you may earn if you wrote actively.
At some point, you have problems with scale: you need to dive into advanced sysadmin skills to maintain your server up and running, or pay to have it done. Wordpress updates, OS updates, all of this is work, sometimes heavy works when your plugins start to misbehave. Let alone the occasional drill when your site is under a DDoS attack, or just stops responding for no effing reason.
Other than investing in mutual funds, resources and stocks, there are three main industries that will pay a residual income. They are insurance, investment brokerage and network marketing. Further breaking this down, there is really only one industry that will allow you to continue working where you are working, while developing a residual income part time and that is the network marketing industry.

There are many ways to earn an income both online and offline. The main goal for most people is to earn a large enough income so they can accomplish and live the life that they choose on their terms. The unfortunate fact is, most people don't have the ability to live their lives on their own terms. They are a slave to their debts and they cannot break the cycle of living pay check to pay check.

The paperback’s formatting could also be improved. I basically just messed around in LibreOffice on Mac to get formatting to work, but I wish I would’ve started with a tool like Jutoh, which is fantastic for formatting and publishing. My workflow was Google Drive exports to LibreOffice, and Google Drive just wasn’t good for editing once you cross 40–50 pages. In the future I’d like to format a better sized paperback.
Also, I know from my personal experience that when you only do something because you think it’s a money-spinner you end up nearly killing yourself to get the idea over the line.  I remember creating a careers advice site that bored me to tears.  Every word I wrote, hurt a little.  All 200,000+ words!  Do not put yourself through this pain.  I know I won’t ever again.