The key questions to help newbies, that doesn't let them to lose money on risky investments:

- What is the error margin of some mining calculators? What is the best ones of them and why they are created? What is the purpose of the fair mining calculators?
- What is the investment to mine Bitcoin on 2018, and about the electricity and monthly earning, and in which [ESTIMATED] months the investment could be paid taking in consideration the ASIC and the energy costs? The same about Ethereum?
- Ethereum is yet profitable with powerful GPUs of 2016/2017?
- What is the best suitable cryptocurrency to work on GPUs?

Those are really basic questions that doesn't needs replies with exacts things, but appointments instead of letting users to risky investments