I haven’t been in this space for long. But, I write on writing not because of expertise or the number of years of experience. But, because I see something that needs address. So, I write to address it. So, you don't have to be an expert first to be able write on writing. And as William Zinnser puts it, "writing is thinking on paper", I believe you write to share your thoughts. So, go on, write whatever whenever you feel like it. Don't let anything stop you.