When I joined the industry newly, I was ignorant for most part of the early days and this made me to forget about an exchange login that I used to store my cryptocurrency when they resume. The exchange has some issues hence it wasn't like I didn't remember everything but my login wasn't working again and that's why I don't like when I hear people talking about using exchanges for storing their cryptocurrency. I advice them not to do that because I don't want them to experience the same thing that I experienced and have made me to not believe that we can be too careful. No coin should be left for an exchange because all their systems aren't strong that they can be easier hacked.