I wanted to invest but I red that the wallet is very risky to use? Many people lost all the money, is this true? How can I save IOTA for years without risk
The wallet is not risky, the users are the problem. You can use the wallet for longterm storage without any problems. Just follow the instructions that are available and you are good to go. 99% of users never had any problems with the wallet, but you won't read about that of course.