When I try to attack, my stoned are taken and I lose. What shall I do to not have my stones taken and invade? `Invading' is to gain or be dominant over the opponent's weak stones or weak points. So, it is not important that your stones are taken or not. It would be a problem if you invade but don't gain anything. When you invade, think where and how you will gain something and choose which step to take. I hope you will get ideas you have never thought of.