I made a video explaining Occam's Razor and Hanlon's Razor. Hopefully this mental model is helpful in deciding which explanations to believe, and which explanations are more likely to bring us closer to the truth.
TLDR: Occam's Razor states that when faced with 2 equally good hypothesis, choose the simpler one, because this has less moving parts (less conditions need to be true), and there are less assumptions made. Hanlon's Razor states that you must not attribute to malice what can be attributed to incompetence, as it is more likely that bad things happen because people did not think things through, rather than having bad intentions.