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Getting Started: Basics
Actually Bitcoin mining is already a specialized business and not profitable for everyone. Therefore we strongly encourage anyone interested in mining to do his/her own research and make the calculations before investing any money to the operation.
Here at MiningRigRentals most people are speculating on the price of their mined coins; this can Include mining the coins, waiting for a later time in which they are profitable. Other ways people utilize mining and rentals in general are for getting that lucky block strike, or snatching up hash rate deals. Whatever the reason, please make sure you are calculating your profitability, as we are not responsible if you lose money.
CoinDesk covered everything important regarding this topic in the following article:
http://www.coindesk.com/information/mining-profitability/
It is written for general audience which means they cover other alt-coins as well.
You can browse https://whattomine.com/coins to help you get an idea on what coins are currently the most profitable.