As with the passage of time more people are entering the cryptoworld and we can see there are many scammers nowadays so can you suggest any ways where newbies could earn btc without investment.
Of course there are. You will just need to invest your time instead of money. Go sell your skills for crypto currencies. Make a new thread over the service section. Mention what you can do and show your work to the people. Eventually you might get hired. Or you can try other websites and then convert your fiat to crypto currencies.
Don't go hunting for free coins. They are just total waste of time.