Betting without research means you are gambling blindly.
While this is true in some cases, it is not always the case, especially when you think about sports betting. It is definitely worth doing some research before placing a bet. For example, in today's Champions Trophy match between Bangladesh and New Zealand, no matter how much research you do, New Zealand is definitely far ahead of Bangladesh. Before betting here, if you look at the statistics, it will be clear that New Zealand performs better at Pakistani venues than Bangladesh, which is why New Zealand is definitely ahead in betting in today's match.