Yep, everyone says it: DYOR - do your own research. On the company you want to invest in; on the sector that the companies lies within; on the share market itself; on the politics of the country the company resides in; on what is happening in the world generally. Most often, the best investment you can make is in research, and that includes in researching what you are actually doing - in other words, reading books, attending online classes, going to real world classes, asking questions - all in an effort to better understand the market you are in and the dynanics of that market. Remember that the goal is to maximise profits and minimise losses. And so all learning is good learning. If you don't know how something works (say, for example, you don't know anything about short selling, and the whole idea just worries you) then get hold of some information (books, courses, etc) and educate yourself. You may never even use that information directly (or you may get excited by it and ...