In which country was the alphabet invented? And how was it improved by the Ancient Greeks?

The alphabet was first invented in Phenicia. The writing of the Phoenicians formed the basis of many alphabetic writing systems. Texts were written from right to left, words were written using only consonants. The advantages of the Phoenician alphabet are that it has a small number of characters, a simple outline, inscriptions can be made on any surface, the alphabet can adapt to any language, it is easy to learn.

In ancient Greece, the Phoenician alphabet was improved by the addition of vowel sounds, this happened around the 9th century BC. in Euboea.