How the 4 tones originated? My native language does not have tones. Why tones are part of Chinese language? How the tones were started initially?
Is it because they do not have so many words?
In my native language full sentences tone changes normally more than words. But in general

The first tone is for general discussion, no high feelings are Low feelings.
Second tone or rising tone is to raise voice, question aggressively...
Third tone is respect
Fourth is like commanding.

In world how many languages have tones?
What happens if I just hear the voice of word from dictionary voice and follow the same?
Old Chinese did not have tones but had consonant clusters, and a larger number of consonants.  It gradually lost consonants and simplified all consonant clusters to single consonants and had to disambiguate words by tone.