Can somebody tell me what sites are safe to use, and can you suggest me some of them?
Everything you need can be found on this forum.
If you want to invest in cloud mining:
hashprofit.com - deposited btc can be withdrawn after 3 months
cex.io - you can sell and buy GH/s as you want but the fees are high as shit
cointellect.com - you'll have to download their mining software, so far so good. (my ref link
http://cointellect.com/?code=ef9ec7dd)
If you want to bet or gamble, you can use these:
fortunejack.com - one of the best gambling sites
anonibet.com - sports betting website, the best one there is
primedice.com - the most popular
BTC dice game website
(You can find a lot more
www.bitfever.org)
If you like social networks, you can also earn some
BTC here on
bitlanders.som.
Just stay away from faucets. They are a waste of time.
If you want to know something more, just ask here.