Hey,
A lot's of sites are working over online to earn btc. but none of those are trusted l think except a little bit sites.
So, I wanna know how many the best trusted sites have to earn btc safely in long time.
Please response the oldest of bitcoin.
You did not say anything about what kind of sites are you interested in, because we do not know if you are willing to invest, or you are just looking for a way to earn BTC without any funds.
If you have money, then I can recommend you cryptogames.com or bitdice.com, but not for gambling. Invest in their bankroll, so you will get a part of the house edge every time someone makes a bet.
You can also go with trading , I would suggest using poloniex.com (best crypto exchange for me) or bittrex.com , but the volume among the all exchanges is highest on poloniex.
If you are looking for a job payed in BTC, then you should visit some freelancer sites. I really like
https://coinality.com but it depends if you are looking for a job for some time, or just full-time work.