In my personal experience, I've started my cloud mining from my very first faucet earnings. However the ROi period is long, so I've cashed out my GHS and stopped my cloud mining that time. However, since I have extra coins from my signature campaign, I've invested in two sites now and I have about 32 GHS of hashing power now.
i have researched that mining is an very efficient way of earning some btc (bitcoins). where do i start with mining? should i invest in mining in the cloud or mining equpment? which is better?
However, mining is now not a efficient way to earn bitcoins, though it was few years ago. In my opinion, cloud mining is better than equipment (if the site is safe and not scam), because you don't need to manage the equipment yourself.