Can you suggest some cost free way to make bitcoins / Ethereum?
Their is no free bitcoin and if you have this understanding to know about no free bitcoin it will really help you not to fall into the hands of scammers. Many newbies have been deceived they could get free money and bitcoin and this has always been used as a strategy by scammers to get people who have this mindset. Anything that is valuable you work for it for you to gain access to it. For you to possess some bitcoin it is either you buy with your own money or you earn bitcoin by working for a service.
During the time bitcoin was created then you could get bitcoin by mining on your computer device but right now you an get it for free. No free bitcoin, you can buy and go into a longterm investment which you will make good profit from it.