Pouring drinks - Oshaku

...However, while there are currently some geisha who are skilled in the classical arts such as the shamisen in the red-light district, which is considered to be the top district, there are also businesses that have no skills at all and only employ women who specialize in prostitution under the name of geisha, so the nature and standard of geisha are not uniform. To become a geisha, a girl around the age of 10 is hired as an apprentice under a training contract, and while doing odd jobs she learns music and dance, becomes a hostess (hinagiko or maiko) at around the age of 12, and becomes independent at around the age of 17. This was the basic pattern from the Meiji to Showa eras. In addition, some girls became geisha without going through the hostess role, and they sometimes moved to other areas...

*Some of the terminology that refers to "pouring drinks" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…しかし，現在は一流地といわれる花柳界に三味線などの古典芸能の技芸保持者がいる一方，まったく技芸がなく売春専門の女性を芸者名義で抱える業者が黙認されているなど，芸者の性格，水準は一様でない。　芸者となるには，10歳前後の少女が仕込みの契約で下地っ子として雇われ，雑用に従事しながら音曲，舞踊を稽古し，12歳ごろにお酌(雛妓，舞妓（まいこ）)となり，17歳ごろに一本立ちするのが，明治～昭和の基本型であった。ほかに，お酌を経ずに芸者になることもあり，他の土地へ移籍することもあった。…

※「お酌」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報