Baseball Rules Explained — A Beginner's Guide to the Basics

Baseball is easy once you see the pattern

Baseball can look like it has an overwhelming number of rules, but it all makes sense once you grasp the core pattern: teams alternate between batting (offense) and pitching/fielding (defense).

The basic structure — innings and switching sides

Game: 9 innings. Each inning has a top half (visiting team bats) and a bottom half (home team bats).
Switching sides: once the batting team makes 3 outs, the teams switch — offense becomes defense.
Winner: whichever team has scored more runs after 9 innings.
A tie goes to extra innings.
Players: 9 on defense (1 pitcher, 1 catcher, 4 infielders,
3 outfielders).

Strikes, balls, and outs

Strike zone: directly over home plate, roughly between the batter’s knees and chest.
3 strikes → strikeout (batter is out)
4 balls → walk (batter advances to first base)
A swing-and-miss or a foul ball both count as strikes (though a foul ball can’t be the third strike itself)

Common ways to get an out

Strikeout / catching a fly ball / fielding a ground ball and throwing to a base before the runner arrives
Tag out (touching the runner with the ball) / force out

Hitting and advancing around the bases

Result	Meaning
Hit (single/double/triple)	The batter reaches base safely off a batted ball
Home run	The ball clears the outfield fence — every runner plus the batter scores
Walk / hit by pitch	4 balls, or being hit by a pitch → automatic trip to first base
Bunt	A softly tapped ball, usually to advance a runner
Sacrifice fly	The batter is out, but a runner advances or scores as a result

A runner scores 1 run by touching first, second, and third base in order, then stepping on home plate.

Rules worth knowing

Force out vs. tag out: if a runner is required to advance (because the base behind them is occupied), it’s a force out (just touch the base). Otherwise, a fielder must physically tag the runner.
Stolen base: a runner advances to the next base while the pitch is in the air.
Double play: recording 2 outs on a single play.
Infield fly rule: with runners on base and fewer than 2 outs, a catchable infield fly automatically rules the batter out — this prevents a fielder from intentionally dropping the ball to turn a cheap double play.
Uncaught third strike: if the catcher drops a third strike (under specific base/out conditions), the batter can attempt to run to first base instead of being automatically out.

Positions and their numbers

1 Pitcher (P) · 2 Catcher (C) · 3 First base · 4 Second base
5 Third base · 6 Shortstop · 7 Left field · 8 Center field · 9 Right field
(These numbers are used in scorekeeping — e.g. a “6-4-3”
double play means shortstop to second base to first base.)

Key takeaways

A game runs 9 innings; 3 outs switches offense and defense, and the team with more runs wins.
Three strikes is a strikeout; four balls is a walk.
A runner scores by touching first, second, and third base and then home plate — a home run scores instantly.
Force outs (touching the base) and tag outs (touching the runner) are different things.
Once you understand the flow of the game, rules like the infield fly, the uncaught third strike, and stolen bases become easy to follow.

This guide is based on the widely used Official Baseball Rules. Some details can vary slightly between leagues (MLB, NPB, KBO, and others).