Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
First 3 anthologies of Japanese waka poetry
The Sandaishū (三代集) are the first three imperial anthologies of Japanese waka poetry. The Sandaishū provided both the language and organizational principles for the rest of the anthologies thereafter. They are: