This technical note is an introduction to the world of financing entrepreneurial ventures. It is a primer on the different stages of a business and the different types of financing available. Most of the capital that high-growth entrepreneurial businesses will secure to fund their future plans is private capital. Private capital includes all the equity financing that is not in public equities; i.e. publicly listed companies. Hence, private capital includes not only venture capital and private equity, but also business angels and equity crowdfunding. We will go deeper into these sources in section 2 of this note.