Questions about bitcoin(or other crytocurrency) to satisfy my feeble mind After a few days of research and reading about bitcoin and ethereum, I got interested on investing in these. Just small amounts to try it out.. maybe $30 - $50 for starters. I'm from a 3rd World Country and want to earn some sort of passive income.

Still after all these research. I still got a lot questions about it.
These ones are one of the most important to me.


Is it worth it to invest in a BitCoin/Ethereum Cloud Mining contract? Lets say i'd purchase a starter plan. because mining rigs are so expensive and I cant run it 24/7.
What are some of the potential risks of trading in Exchanges? 
Can I start trading with $30 to $50 staring budget? can I get somewhere with this budget?
Cloud mining is generally only profitable for the Operator (otherwise they would mine themselves instead of selling their hash power).
Your account or the exchange getting hacked, or the exchange deciding to suddenly close (perhaps also claiming to be hacked) and taking your funds. If you buy coins on the exchange always use 2FA and take the coins off of the exchange (send to your own cold wallet) as soon as possible.
You can start with as little as you wish. Focus on learning at first. Large, quick profits are very unlikely for a beginner with limited funds. Most "traders" lose money because they are less informed than coin developers/promoters. Focus on code you can see in GitHub, not what developers are promising to deliver in the future.