That's right, security should come first. Also, you need to minimize the risks as much as possible, then you will not be able to lose everything.

I know only one way to minimize risks when trading, it is to work only with large exchanges, and everything else depends on luck.

You're right, I've been following the rule to minimize the risks but sometimes i'm wondering how others haven't known at least this basic knowledge. It's hard feeling especially when you only have little money to lose so learn act quickly when you need to. Newbie people need to get educated to not fall into this trap. Most people need to be careful though.

There are really situations on where those people who do only have limited or little knowledge about trading do really make out some profits even into its limited information
yet we cant really deny that luck do really have some part where it can really affect someones trade even though no matter how good he is or noob but there are instances
where you can make money in spite of lacking those capabilities but those luck wont really last long yet sooner or later you would really experience mistakes and which causes
for you to lose money and thats the time you would consider on learning things up to reduce risk.