Bug triaging is an important skill that every tester should know about. This is a comprehensive guide by Bashiul Alam Sabab that includes lots of graphs and flowcharts explaining in detail how to do it well.
Ash Davies expresses an interesting opinion on why having a good feedback cycle is even more important than a QA process. And summarises it with a punchy "Fail fast. Fail often. Fix quicker.".
Everyone gets frustrated about their role sometimes. But not everyone shares about it. Shout-out to Maaike Brinkhof for describing the common fundamental problems with how QA is treated.
A good addition to that is James Bach's article on Desperately seeking testing.
Here's a great overview of the definition and responsibilities of TestOps that Joe Colantonio put together, learning from the interviews that he did with two specialists in that field.
The answer to this question is rather obvious — it's best when both are combined. But what I found the most valuable about this article is how clearly Anna Kalemba and Adam Lochno explained both techniques.