Whether you're just starting out as an indie writer or you've been at it for a while, there is always a lot to learn in order to maximize your results. Whether you measure results by how many people sign up for your newsletter, how many reviews you get, or by the "easiest" metric of how much money you earn, having good information as the basis for your decisions can make a huge difference.
Here are some recommendations, based on value I've found from others whose results have been much better than my own. These have helped me, and hopefully they'll help you too.