More and more people outside the US want to invest in US financial markets.
A book, written specifically for non-US citizens living outside the US, covering all aspects of investing in the US financial markets. Chapters on existing financial markets, investment vehicles, how to open the needed accounts in the US, taxes, etc.
So you can find one or more solution to any financial calculation need you might have.
An online resource where you can search in plain language for a financial formula that can help you. You will get one or more results, and each will be explained: what is it for, how is it different than alternative formulas, how to use it, common online tools that you can use, etc.
You have a friend going through a bad period or experience (health, emotional, financial, etc.) How can you help them?
A website, app or even a book, with helping guides for many situations you might find yourself in with your friends and family.