Everything in geometry starts with a simple idea: the point. A point isn't a thing you can hold or measure. It’s just a location. Think of it as a specific spot on a map, but with no size at all. It has no length, no width, and no height. It just marks a position.

Since a point has no size, we can't truly see one. To show where a point is, we draw a small dot and give it a name, usually a capital letter like A, B, or C. This helps us talk about specific locations.

Now, what happens when you line up an infinite number of points right next to each other? You get a line. A line is a perfectly straight path that continues forever in two opposite directions. Like a point, a line has no thickness or width. It only has length, which is infinite.

We draw lines with arrows on both ends to show that they don't stop. A line can be named by any two points that are on it. For example, if points A and B are on a line, we can call it line AB. Sometimes, a single lowercase letter, like l, is used to name a line.

Points and lines are the fundamental building blocks of geometry. Every shape, angle, and complex figure you'll encounter is constructed from these two simple concepts. They provide the basic language we use to describe the space around us.