Puri opens with the things everyone already calls risky. Jumping out of a plane. Putting money into crypto. People handle those, and the label is why. You jump with an instructor who has a thousand jumps behind him. You put in five percent of your net worth instead of all of it. The word risky triggers the seatbelt.
Then he points at 2008. Mortgage debt carried a high rating and a reputation for safety. That reputation was the danger. People borrowed hard against a thing nobody had marked, and the whole system went over with it.
So the list worth writing is the unlabelled one. Puri gives it four entries, and the first one is the one people argue with.
The second flavor is safety, because the comfortable path can put the goal out of reach while you sit in it. The third he calls eyes wide shut, the thing you filed as safe and never checked. The fourth is less a danger than a question. Are you taking market risk, execution risk or technical risk? Each one fails in its own way, and the answers do not transfer.
Read together they make a short audit. One flavor asks what you are settling for. One asks what your comfort is costing. One asks what you have assumed. One asks what kind of bet sits on the table.