The idea you could earn a living at home in your pajamas or on a tropical beach while sipping margaritas would have been laughable to employees in the 80s, but now, it’s a reality that many people are starting to pursue.
One of the simplest ways to start making extra money online is to negotiate a remote role with your current employer. Obviously not all employers will allow this, but if you work in an office, it's worth asking.
Work on a self-employed basis, lending whatever skills and expertise you have to clients who need such support. While you lack the stability of a monthly paycheck, you become your own boss in a given discipline
There may be profitable items that you can flip and resell on eBay for profit right in your neighborhood. When the weather is nice, you can almost always find garage sales within a few miles of your home.