Intro to music please, what is the difference between three-four and six-eight beats?

One, beat:

Three-four beat: three beats in a measure

Six-eight beat: six beats in a measure

Two, note length:

Three-four beat: one beat is a quarter note.

Six-eight beat: one beat for the eighth note.

Three, rhythm:

Three or four beats: relatively slow six or eight beats

Six or eight beats: relatively fast three or four beats

Music beat refers to the combination of the strong beat and the weak beat of the regularity, specifically in the score of the total length of the notes in each bar.

Expanded Information

Common musical beats include one-four, two-four, three-four, four-four, three-eight, six-eight, and so on, and the length of each measure is fixed. The beat of a piece of music is fixed at the time of composition and does not change.

In music, time is divided into equal basic units, each of which is called a "beat," or one beat. The time value of a beat is expressed in terms of the time value of a note, which can be a quarter note, a half note, or an eighth note (with the eighth note being the beat).

Music always alternates between strong beats and weak beats, and this alternation cannot be haphazard or arbitrary, but rather constitutes the smallest possible beat according to a certain pattern, and then the cycle is based on this.

Baidu Encyclopedia-Music Beat