Every person has their own strengths and weaknesses when betting.
Sometimes certain types of bets bring them their best fortune, other types of bets their biggest losses.
Even the players/teams you choose to bet on are important to your and you may understand that player/teams patterns better than others.
For example when betting on Arsenal you often predict their results better whether they are more likely to win, lose or draw. Maybe because you support them, love or hate them you can predict their perfomances better.
Once you understand your own strengths and weaknesses you can them more confidently know how to stake your money.