Ok first of all, do not ever bet money that you aren't comfortable losing. Ok.... so it's
never comfortable to lose money, but I think my point is obvious. Don't bet money you need to pay your bills. Don't chase your losses. If you lose, don't go betting bigger and bigger trying to get your loss back as fast as you can. You can get yourself in a huge hole very quickly. All sports are frustratingly unpredictable. Games and totals that seem like a sure thing lose all the time. I know from years of experience.
Stay disciplined with your betting. This hobby can humble you and your wallet in a hurry.
With that said, it's a hell of a lot of fun when you're winning. As long as you're responsible and don't lose more than you can afford to lose, I really do just consider this a fun hobby that is occasionally extremely rewarding (I won $600 today on Canada beating the spread against Czech
).
Be weary of heavy favorites. A straight bet on the moneyline (winner) for a great team beating a bad team is going get you a very poor payout. As a hockey fan, you know it's not at all uncommon for very good teams to lose to bad teams. Just ask Sharks fans what their record is against Buffalo in recent years. Spoiler, it's bad... real bad. In my opinion it's only worth it if you parlay heavy favorites with another team or two (A parlay is when you combine two or more bets on one slip. They can have huge payouts but you have to be perfect. If you parlay six teams and get only one wrong, you lose).
Another thing to keep in mind, taking the spread in NHL games is a double edged sword. The spread is 99% of the time -1.5. This means if you pick the favorite at -1.5, they have to win by two or more goals. If you pick the underdog at +1.5, they can win the game or even lose by a goal and you still win your bet. Sounds nice but the payout isn't usually great. Anyway, the hard thing about spreads are those damn empty nets. What happens every single time towards the end of a close hockey game? The trailing team pulls their goalie. That empty net can make or break you very easily.
One good thing about hockey, as has been said, is it's not very popular and sometimes there are lines that are a little off and favor the educated hockey fan. Enjoy!