Amazon KDP (Kindle Direct Publishing) has become one of the easiest ways for people to publish books and earn passive income. The process is pretty straightforward: you format your manuscript, design a cover, upload it to KDP, set your price, and your book is live on Amazon’s marketplace.
What makes it interesting is that you don’t need a big budget to start—just time, creativity, and consistency. Some people focus on low‑content books like journals or planners, while others publish full novels or non‑fiction guides. The earning potential really depends on how well you research your niche and market your titles.