Sports betting may seem easy. It’s not. Here’s why

              FILE This Nov. 20, 2018 file photo shows a scrolling video board with basketball scores reflected in the ceiling of the new sports book at Resorts Casino in Atlantic City, N.J.  The race to legalize sports betting is on now that the U.S. Supreme Court has allowed it in all 50 states, but will it provide enough extra tax revenue to make much of a difference for schools, roads or pension debt?  (AP Photo/Wayne Parry)

ATLANTIC CITY, N.J. (AP) — Wanna bet on sports?

First, make sure you know what you’re doing — and the odds against you.

Seven U.S. states now offer legal sports gambling, and as many as 30 more will consider jumping on board in 2019. So here are some of the basics — as well as some more esoteric aspects — of betting on sports.