This is a good list of tips. However, the most important thing is attentiveness when researching a project. You should pay attention to any suspicious elements when researching a project. Also, you should not lose your head from the promises of the project.
It's definitely true. Some projects are making too good to be true promises just to attract investors. We shouldn't get hooked to flowery words from some developers. We also have to check their legitimacy and every developer's reputation. You have to be analytic and check every doubtful detail of a project before you invest.