Being assertive and sounding confident is always a good start. No leader of the opposition is going to get far without those qualities. And Kemi Badenoch certainly manages that. But winning at prime minister’s questions requires something more basic than that. Something fundamental. A very basic understanding of the facts.
Not just reading a headline in the papers and a few posts on social media. Not just listening to a junior minister sound a bit confused on the Today programme. You need to put in the hard yards. Or at least do some very elementary research. Otherwise you risk coming badly unstuck.