When it comes to sport betting doing a good research is very important, those that always study a game very well and conduct a good research about the game and the players always end up winning more than those that don't conduct research, a friend of mine said he usually do not conduct research before playing a game because it never works for him, conducting a research don't mean you will always win the game you predicted but you have a higher chance of winning when you research.
Doing research will help you analyze historical data reveals pattern that can guide your predictions, there are history that will help you make good prediction, Research helps you rely on facts rather than emotions.
Betting without research means you are gambling blindly.
Like sports betting where 18 Champions League matches will take place soon. Without doing analysis is the same as betting to lose. There are bets that are very small in the need to do research and analysis, but not in sports but in other bets outside of sports betting.
Even in sports betting, you must have a basis related to the sport. If you don't know the sport but still bet, it is no different from what I said.
Liverpool did not play players who often played or the main squad. PSV need a win over Liverpool. Well, without analyzing the players, the bet could be arbitrary.