Investing is a crucial part of personal finance, and understanding investing will give you a great starting point for the concepts of Velocity Banking.
Let's start technically - your standard dictionary (or Google) will tell you that an investment is "expending money with the expectation of achieving a profit or material result by putting it into financial schemes, shares, or property, or by using it to develop a commercial venture."
Now that you've read a definition that overcomplicates the topic of investing, we can get to a simple explanation.
A financial investment is to multiply money over time.
Principal x Interest + Time = Profit
Investing as a broad term can also mean putting in time and effort - not just money - into something with to gain a long-term benefit. My most significant piece of advice when it comes to investing hinges on this second definition.If you're going to invest in anything the main thing you should invest in is you.
Whether you do this by putting time and effort into your business, gaining a second-degree education, spending time with your family, or understanding your finances - always invest in you. The very first investment you make should be in you, and once you are ready for your next investment, keep investing in you. The rule I follow when it comes to investing, is before you invest in something outside of yourself have at least 100k in cash and 10X your income.