how do you lot do keyword research for blog posts?

start from a seed topic and pull every question I can find (autocomplete, people also ask, the questions filter in whatever keyword tool). then group them. loads of questions share the same results page, so they're one post, not five. for each group look at who ranks. all big brands, park it. forums and small blogs in the top results, go for it. write the post around the main question and answer the related ones as subheadings.