Tennis rules govern court dimensions, scoring, equipment specs, and play standards across matches, sanctioned tournaments, and casual games with tested explanations.
Walk onto any public court and within ten minutes someone will tell you the rule of thumb: the ad court is on the left, the deuce court is on the right.
There is a tidy idea that gets repeated on coaching blogs and in pub conversation: a tennis court is just a rectangle, 78 feet by 36, with a net down the middle.
A father sat next to me at a 12-and-under tournament last spring, leaned over, and asked what "thirty-fifteen" meant. His daughter was serving. The scoreboard had just flipped.