This discussion has been treated more than ones here, so I believe every investors or a beginner should be able to understand the concept that keeps their investment healthy and running however I believe this is one of the reasons why at @JayJuanGee introduce the method and the reason why an investor should have an emergency funds and also a reserve funds was actually because of a situation like this so that with a proper utilization of it an investors could hardly run into a problem no matter how it may be, however just like you said is not an investment wise to put in everything you have on investment because with the lack emergency funds or reserve funds their is a big chance of getting into trouble on the process.