I'm new to cryptocurrencies and I would like to know, is there any possible legal issues with cryptocurrencies? I'll appreciate your valuable ideas and please help me.
It depends on where you are located and the jurisdiction that you are under.
But generally, there shouldn't be much of a risk as long as you are transacting with bitcoin only, or bitcoin for goods or services without the involvement of fiat currencies. If you are trading bitcoin with fiat currencies, especially with peer to peer platforms, you may have to check up on whether or not you need a license for that.
You may also need to check up with whether or not you'll need to pay CGT on certain transactions, even if it was just purchisang goods/services, depending on your country's definition for CGT rules, it may still constitute a capital gain.