Good point. Here are mine:

1. The systems mindset. Almost everything we do is a repetitive task, and for every repetitive task we have a process. It's tempting to think that a lot of what we do is complex problem solving that is not repetitive, but that's not true. We still follow a process to solve seemingly complex problems, even if we don't initially realise it or it initially seems complex. That means most of what we can do can be described and documented. If it can be documented, then it can (a) be systematically optimized and improved, (b) act as a guide for us to follow to ensure quality control, (c) reduce the required mental energy to perform the task, due to not wasting energy on thinking about the process, and (d) have someone else (with any necessary requisite knowledge) complete the task.

2. Hiring excellent people for very little money. People are motivated by much more than just money. You can pay people a lot less by giving them much more in the other areas. An easy way to get started is with outsourcing. If you can afford to pay someone $4/hour there's no reason for anyone not to have a virtual assistant. This obviously pairs very effectively with documented systems.

3. People skills. This is a large area but the 20/80 is to read and take notes on How to Win Friends & Influence People, and turn it into a 1 page cheatsheet to follow when interacting with anyone.

4. Idea extraction. This is a term that was coined in a business course I did, the idea being to identify business opportunities by interviewing people to uncover their business problems, and continuously drill down to their root causes. But it has much wider application. The ability to uncover other people's root causes is incredibly helpful in sales, customer development and all kinds of situations.

5. Journaling. Whenever I am faced with uncertainty (constantly) I turn to journaling, and it is incredibly effective in problem solving and raising my self-awareness.

6. Learning. This is one I'm still working on, but understanding how we learn has been very helpful in creating personally effective methods for learning and memorization.

7. Productive downtime. Another one I'm still working on, but is based around the idea of pursuing tasks that are enjoyable but are still beneficial, as opposed to time wasters like watching tv, playing computer games etc.