Question

how were script invented

Answer 1

Written language, which originated in Mesopotamia, spread first to Egypt and then to other regions, including Crete and then Phoenicia. 

Answer 2

Written language, which originated in Mesopotamia, spread first to Egypt and then to other regions, including Crete and then Phoenicia. The alphabet of most modern languages originated in ancient Phoenicia and first came to Greece sometime before the 8th century BCE, from whence it spread.