Only time can show how secure is the platform. The platform can look like secure but not to be secure at all. How to understand if the platform is secure or not?
The most important is to find a new and prospective project during its start when the price of its tokens is very small to have the maximum profit from investment. If you invest when the project becomes more popular and all people invest money in it you will never have the big profit from your investment.
That is why IDO and different time of token sale continue to be very popular. Because it allows to invest in the prospective projects in the early stages of their development to earn maximum profit from investment. To do this it is necessary to carefully analize the project to find the most prospective projects for investment.
You are right but it is very important to have enough experience to find a really prospective projects because most of new projects becomes unuseful for people and stop to work and the price of their tokens falls to zero.