When I first started I put a specific keyword in every post, thinking I would rank because of it. It was a two word low comp keyword, with around 40k searches every month. This was what I did for the first few weeks. Every post I would try to cram in "X X" a couple of times in the post without making it spammy.
What I do now instead is research keywords around the specific subject I'm writing about and put those in, ignoring the "X X" keyword completely.
I'm wondering if this is the right way to go? Do I have to have the specific keyword in every post to rank for it?