If you are afraid to invest, then don't do it. The only way is your trust. Without trust and taking risks you will never gain money and it will be hard for you to try something new
You will trust the project if you personally do your own homework of studying and researching the project. If you rely on others' advice and opinions, you will not be confident on your decision. There is always grey area. So invest only on projects that you can say that you diligently do your part.