https://cointelegraph.com/news/new-study-says-80-percent-of-icos-conducted-in-2017-were-scams
There always some good projects here, such as ETH, EOS, TEROS and many more
To be sure of an ICO to keep secure of investment , you should do:
1: Check the project concept,, don't touch those TOO GOOD TO BE TRUE, TOO GREAT TO BE TRUE PROJECTS!
2: Check the team member info: include linkedin info, Google search result
3: Check the Questions and Solutions, if they are real questions, and if they are good solutions.
4: Check if the team have joined and blockchain conferences!