When did you start using Chinese characters?

About BC14th century, late Yin and Shang dynasties. "Ideographic symbol" evolved into a relatively stereotyped "Oracle Bone Inscriptions". This is considered to be the first form of Chinese characters. The characters carved on the tortoise shell of animal bones and found in Yin ruins are considered as the direct ancestors of "modern Chinese characters", which can prove the continuation of Chinese civilization. For thousands of years, Middle Easterners have been unable to read the hieroglyphics of their ancestors. Only modern people in China can understand some "Oracle Bone Inscriptions" in Shang Dynasty. The words on these tortoise shells were originally used to predict good luck or bad luck. Ancient people thought that the cracks caused by carving some problems about diseases, dreams, hunting and weather on tortoise shells and then baking tortoise shells and animal bones with fire could be judged by fortune tellers according to the shapes and directions of these cracks. This is the ancestor of the modern Chinese character "Oracle Bone Inscriptions". Up to now, there are more than 5,000 species of "Oracle Bone Inscriptions". And there are more than 1000 kinds that can be interpreted.