There isn't a definitive answer to this question since it depends on a variety of factors, such as your skillset, interests, and available resources. However, there are a few businesses that are generally considered to be relatively easy to start up.
One option is a home-based business. This could include something like starting a blog or an online shop. These types of businesses can be run with relatively little upfront investment and can be operated from home, which makes them fairly easy to set up.
Another option is a service-based business. This could involve providing freelance services like consulting, accounting, or web design. These types of businesses often require less capital to get started and can be run from home as well.
Finally, you could consider starting a franchise. This option can provide you with a ready-made business model and brand, which can make starting a business easier. However, it's important to research franchises carefully to make sure you're choosing a reputable one.
Ultimately, the easiest business to start is the one that is the best fit for you in terms of your skills, interests, and available resources.