Learn from her example.
Same question as I, but as of now I am doing my best to make a quality/substantial post. So I am more on reading first, and making sure that my post is relevant and on topic.
To be honest, a quality post can't always be that long, as long as your post has the content that will help, then it should be fine.
I myself have gone through the same process. Also, at first I don't want to get into the sections that I'm not familiar with because I don't really have answers to the topics. But I've realized that, posting or answering topics is not the only thing I could do here. That's the boundary of it, I've restricted myself to the things that I only know. But by reading those topics that I'm not familiar of, I've began
learning and
educating myself. Eventually, I began to
contribute also what I've learned from those people.