How did people of the Shang dynasty practice ancestor veneration?

by entering into trances through meditation

by reading messages written on oracle bones

by reading holy texts like the Upanishads

by performing songs, dances, and plays

Reading messages written on oracle bones

The answer to this question is by reading messages written on oracle bones

Even though the written language was not recognizable by them first, many of people in shang dynasty found a lot of oracles from the bones of ox, birds, and goats. They can only manage to fully decipher the language in early twenty century