Quality content is subjective. Some people will want a beginner-level summary while others want more depth and expert insights. Quality content will be better than the content that currently exists and readers will find it useful, memorable and are likely to share the content.
As SEOs, we typically write about things that people are searching for. This makes the content useful, but if you read many top-ranking sites, they often say the same things. Reading the first few results might feel like you’re reading the same content over and over again.