No matter what we shouldn't undermine the important of knowledge in bitcoin investment without basic knowledge we can't really know if we have the discretionary income that is needed for investing in bitcoin. However knowledge is useless without action, for that all we need to start investing in bitcoin is basic knowledge and the ability to determine whether we have the discretionary income to invest with. Therefore every other thing we need to know as regards our investment we can learn it along the line while accumulating bitcoin.
Knowing what discretionary income is and having basic Bitcoin knowledge are two totally different things. The discretionary income idea and meaning can be implemented in different areas when making financial decisions and not just on Bitcoin. The basic knowledge for Bitcoin is for the user to have the average information of what they actually want to get into and how to deal with it without needing someone to hold their hand while they learn in the process.