1. Relying on the heart
Yes, your favorite team is/was good! Yes, they had that really good play/game/season! That doesn’t mean they’ll be good this time. Too many times do people bet on their favorite team simply because they want them to win. Smart betting requires research and data. It’s not because you “feel” like they’re going to win. Many bettors, especially new bettors, get blinded by their favorite team.
Now, your favorite team may win, so you can certainly bet on them AFTER you’ve done your research and decided they’re the best choice.
2. Chasing losses
Trying to win back the money you’ve lost by placing bigger bets is a poor choice. Most of the time, the people who do this are flustered, panicked, and desperate because they’ve already lost money. They make irrational decisions and forget all about making education decisions. This then leads to more losses. So, remember reevaluate your bankroll. Remember it’s ok to lose. Be prepared to lose your money. Don’t every try for a hail mary to win it all back at once.
3. Not line shopping
Lines are changed based on placed bets. Bookies want to even out the number of bets placed on both sides of the line so that there is enough money from the losers to pay the winners. So while one bookie has one line,, a second bookie may have a different one. Try to find one with the best return/smallest loss for you. Smart betting is focused on decreasing your losses and increasing your chances of winning.