I am new to crypto currency and I don't know the Bitcoin is legal or not plse help me
Bitcoin is a digital decentralized currency,in the sense that no government nor Central Bank has any control of its price nor value,and there abounds no regulations whatsoever in the system...
Due to the absence of regulations and it's pseudo-anonymity,its viewed as a scam by most people and nations alike, hence some nations have placed a permanent ban on the currency and stopped every cryptocurrency related activities within their shores.
Other reasons abounds why nations are trying to crack down on the system, as its viewed as a direct threat to Fiat and it's safe, secure, transparent and quick transactions is much more attractive, hence most governments do not want such competition with their national currencies..
Bitcoin definitely is purely Legal ,but due to the aforementioned reasons you'll do well to confirm if it's legal in your Locale ,you could surf the internet for that information ,as I'm not privy to it,i can't really tell you if it is Legal over where you are..
Despite the fact that it's legal,the system is also used for fraudulent activities by scammers so you'll have to be careful on it,
Make sure you keep you private keys "private"
Store investments in reliable exchanges(Beware of fake exchanges)
Beware of phishing SCAM
Always use a reliable bitcoin wallet(Hard wallet)