Genesis Mining offers an easy way to invest your money. Genesis Mining is a cloud mining service where the user rents power to mine instead of buying a rig.
Even though I have never used this service, I do not believe it to be a scam like some that claim it to be, but also I do not think it is that profitable. Imagine that you start a contract and you paid the fee to mine for 2 years a certain cryptocurrency..... now Imagine that that currency price drops you will be losing money potentially for the duration of the 2 year contract.
It would be much more worth to buy a rig to mine by yourself, especially when you can pay thousands of dollars for that contract, you would invest those thousands of dollars and buy the rig that would be mining, potentially for longer than 2 years.