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In 6/8 time, there are 2 beats per measure, and one dotted quarter note has one beat. In 9/8 time, there are 3 beats per measure, and one dotted quarter note has one beat. In 12/8 time, there are 4 beats per measure and one dotted quarter note has one beat. In 6/16 time, there are 2 beats per measure and one dotted eighth note has one beat. Etc. Another way to extend the duration of a note is by using the tie.
Let's take a simple music sheet: As you can see, the time signature is given, and it's 4/4. That means every measure has 4 beats of quarters. I assume you know about the duration of the notes. Every measure/bar in the music sheet is defined by the vertical lines you can see in the image above. Between every two vertical lines, you must have notes whose duration add up to 4 quarters (1 whole, 2 halves, 4 quarters, 1 half and 2 quarters etc). As per Wikipedia, the measures/bars are used in order to help us read music sheets: