All you have to do is not to trust easily and verify the project by yourself. A good research will help you determine wether a project is good or not, reviews will also a good help since this is response from the community. Don't trust, verify! Same goes when you are storing your funds, don't put it in a wallet which gives you no full control like exchanges and closed source software. Electrum, Hodler and myetherwallet are one of the open source software that you could verify your funds.