When something bad happens, don't assume anyone did it on purpose. Instead, use Hanlon's razor to look for other reasons for people's behavior.
Use Occam's Razor to keep things simple when designing a business plan.
Simple, safe English is often not the best choice. Take, for example, the word happy. If you can read this blog post, you can use that word, but should you?
We generally prefer to discuss things we understand rather than things we don't, and that can be a big problem in interviews and meetings.