I just want to know how those people behind bitcoin secure the money they will invest because as far as I know there are lots of hackers all over the world.
You really have to take careful steps before deciding where to put your money. The wallet thats safe could depend on your country. It would be better to choose one thats known by many people or publicly advertises itself. You can also ask advice from your local area regarding what is the best wallet or the safest way to store. Dont rush in making decisions because you do not want to regret loosing your hard-earned money.