Moneyline is you pick who wins, thats it. spreads is who covers the margin ? sometimes your team can win however not cover, hence the w t f losses. wanna go for over or under? it means bet on whether both teams together score more or less than a number. parlays is a sexy payday i cant deny it however all legs must hit, lol. one loss & you are done , in here you will find huge variance, never ever treat them like a system. juice, vig is the books builtin commission rate, that is how they make money even if your bet balance out. So I always compare line at different sportsbook to find out the best deal for me, as there are some that charge less juice. Parlay should never be relied upon to make real cash.., just think of parlay as fun parlays, dont think it is your bankrol builder.