First of all it doesn't take much knowledge to start investing in Bitcoin. Gaining knowledge can be essential to prolong and secure your investment. Secondly, one of the fundamental main points of investment is the source of income. If you have no source of income then I think there is no need for you to invest. I don't think anyone would suggest investing if you have no source of income, there is no question of investing with debt. This may be an act of sheer folly. To invest you must first have a source of income, which is surplus after meeting your and your family's needs or an alternative source of income.
The basic knowledge is enough for someone to start investing in Bitcoin once their sources of information are reliable. This ensures that later, they will not think of selling their Bitcoin unnecessarily. One thing to consider when investing in Bitcoin is to have emergency money set aside. In case any emergency arises, one can solve it using the emergency funds. Many new investors end up selling off their Bitcoin just because they don't have emergency savings. In fact, some are forced to sell at a loss due to an emergency and lack other means of getting the money to solve the problem. Emergency savings are always a good backup for Bitcoin investment, as it is volatile in nature.