What is quality content?

Quality content achieves a goal (e.g., it drives traffic, Google search rankings, engagement, or conversions). All that matters is what you get out of your content, not how much time or money you spend creating it. Quality content is successful content.
it is evergreen which stands the test of time and keeps people coming back for more. It is relevant, accurate, comprehensive, and answers the questions or pain points that people arrived on the page looking to solve. It also does this in the most effective and efficient way.