Ross, if you follow cricket, it's largely the same. The few exceptions;
One batter (batsman) on the field at a time.
Fielders wear leather "mits", or huge gloves, on one hand.
Field is 1/4 of a cricket field (90 degrees)
7 fielders, one pitcher (bowler), one catcher play defense.
Pitches are overhand, around 90 mph most times.
Pitches have to make it into a "strike zone", over a plate, between the chest and knees roughly. Without bouncing. 60' 6" away.
Three strikes and you're out. Swing & miss = a strike. Hit a ball 'out of bounds' = a foul ball = a strike, but you can't "foul out".
When you get a 'hit', you must run to the bases in order - first, second, third, and home. You can stop any time you reach a base. You can't go backwards.
Touch home plate, and you score a "run". Most runs wins.
If a fielder catches a hit ball before it touches the ground, you're out.
If a hit touches the ground and fielder grabs it & throws it to the next base a runner must touch before the runner touches it, he's out. You can do this two or three times on the same hit ball (double-play and triple-play), if you're fast enough.
Three outs and the 'inning' is over. Innings have a "top" and "bottom", where each team plays both offense and defense alternately.
9 innings, unless the score is tied, in which case it goes until someone is winning at the bottom of an inning.
Game takes around 3-4 hours tops, most of the time.
Stuff like steals, infield fly rule, double-swap substitutions, pinch hitting, etc. we can save for later.