Th principle of investing - which is a core part of financial freedom - can be fairly basic. Here's a view on those principles
https://www.investopedia.com/articles/basics/07/grahamprinciples.asp?utm_source=news-to-use&utm_campaign=bouncex&utm_term=15748701&utm_medium=email
https://www.investopedia.com/articles/basics/07/grahamprinciples.asp?utm_source=news-to-use&utm_campaign=bouncex&utm_term=15748701&utm_medium=email