Ask HN: Can I Post Train my own LLM?

I don't want to pre-train because theres so many models out there already BUT I don't like their 'vibe'. can i post train my own model on select texts to make said model feel how I want it to?

doesn't need to be a massive model either. just want to keep it simple.

Thanks!!!

im not sure. from watching karpathys video he mentions post training. i think it comes before fine tuning. are these the same thing?