BCC is the acronym for bit-connect a complete scam that is not related to bitcoin, do not by it. BTC and BCH (bitcoin cash) are the only BTC coins you should consider buying. BTG probably isn't a scam but it to new for me to recommend.
BCC is a scam hoping to target new people who confuse it for BTC. Don't trust me, do your own research but you will find its true. A reasonable explanation on Steemit is here: https://steemit.com/scam/@thegrinder/the-bitconnect-scam-exposed