Can someone explain it to me? I heard that the transaction speed would be much more faster, but I don't know how it works
Trust me,you don't need to know anything about the Lightning network.All the hype about super fast transaction speed is exaggerated.The current speed of normal btc transaction is quite good.
Think of LN as a second layer over the bitcoin core blockchain,that's centralized and therefore you don't have to wait for confirmations.It's not the best explanation,but this is how I see LN.