For beginners struggling with getting crossed-up, I found this short tutorial vid that I think is a nice reminder that it is not always needed to block cross-ups. This is something that I sometimes tend to do too often myself.
So, I hope this vid with basic tips on how to defend will help you.
(also there is no need to bash the creator of the vid if you think you know things better. Just post your advice in a respectful way or make your own video.)
Props to the creator: @JusticeSoulTuna