Free real-time odds sites help with line shopping. Compare the same market...

https://elliotsinspiringblog.scriblorax.com/posts/how-do-i-track-bets-so-i-stop-forgetting-the-losers

Free real-time odds sites help with line shopping. Compare the same market across books, then verify your bet slip shows the right book, pick, odds, and stake. A quick check can catch mix-ups before you place a wager, but it won’t guarantee a win, either.