The easiest way to go broke fast in this space is by joking with your security. It is a very big threat that we all face. 
So big that it is included in the blockchain trilemma; “decentralization, security, and scalability”. 
Beyond On-chain hacks, comes big physical concerns. We will visit one of those today, known as Keylog Attack.
You might find it very insightful to go through this article