Hi guys, there are so many ICOs, such as those listed in
https://www.coinschedule.com. It's pretty hard to review them one by one.
Which elements I need to consider, the team? the product? the promoting technology? or something else?
Thanks for any suggestions

Yes, the team of the ICO project is the most critical thing you must consider even before reading the white paper. If the team is real with a credible profile, then you can invest in it.