Seriously, I don’t know!
It is subjective. A good content depends on your readers and audiences. If you write and people who comes to your blog like it, then it is deemed as good content to them. Anything can be good content, as long as you have the audience for that kind of content then people will come.
So yeah, I don’t really care about tips those niche bloggers talk about. I’m not saying I’m that good or anything, but they may be good because they write about what their readers want to see. It is all about that most of the time. And you can produce good content too. Find out about who visits your blog. Find out about what they like and write about it. Make them happy, make them interested and you’ll be in good hands.
That’s all from me. I’m a beginner.