I played pretty heavily at the start of 18 but then stopped. Got the $100 edition
You should know that X swings the bat
All you need to know is to enjoy the game, know that there will always be some issues, but enjoy the game and compete. Also Team affinity is something to get excited about.
Showdown is pretty fun too
100x improvement from 18. Pitch speeds are faster and contact hitters are relevant in 20. Defense is huge and its easy to botch plays in the outfield, meter defense is the way to go this year.