It depends on what I’m writing. My blogs typically tie into something that I really like, I’ve seen or have read. I won’t call them reviews, though I do tend write about movies, documentaries, characters I like then link them in some way to a book I’ve read. Here’s an example for Chris Nolan and his film Tenet. http://scottbutler.co.nz/2020/09/10/narrative/

So I’ll use Google to gain some insight about the person I’m focused on, will watch a film, check out reviews, read different books and combine what I’ve learned over the years through writing if that makes sense.