Kyosuke
This is Kawaguchi Hidetoshi. This is a humble answer to the question.
As the Buddhist theory is called the “Eighty-Four Thousand Dharma,” it is said that the Buddha explained his teachings using good, ingenuity, and convenience according to each root (nature to move towards enlightenment) of an infinite number of sentient beings and their own hesitations, suffering, worries, ignorance (fundamental ignorance), bad deeds, etc.
The teachings of Shakyamuni were compiled into letters by his disciples and various saints and school monks to later generations, and have been handed down to the present day as the “sutras” that exist today. When Shakyamuni was in his reign, he was not allowed to express his teachings in writing, so all of the “sutras” handed down today were written hundreds of years after the fall of Shakyamuni.
http://ja.wikipedia.org/wiki/仏典
http://ja.wikipedia.org/wiki/結集
From Magadha, where Shakyamuni is said to have been used, it was later transcribed using the main language used by the disciples who memorized the teachings, and was initially expressed in Pali and Sanskrit, and then translated into regional languages as it spread to various places. In Japan, sutras translated in Chinese from China have been introduced, so the Chinese scriptures have taken center stage.
Of course, in the translation process, the translator's intentional and arbitrary ideas and philosophies are sometimes introduced, and there are also issues such as whether the meaning of the original text is completely expressed as it is, but it seems that due to advances in linguistics and philology, it is possible to translate quite faithfully.
I don't know which sutras you are interested in, but as an introductory colloquial translation of the main sutras of each denomination, I would like to recommend “A Book of Well-Understood Sutras” by Kodansha Yuki Yoshifumi.
Furthermore, if there are sutras that you would like to know the details in more detail from there, I think it is okay to read specialized books, commentaries, etc., take courses hosted by various denominations and temples, take courses at universities and research institutes, etc., and proceed with in-depth learning.
Let's thoroughly learn and advance the teachings of Buddhism, and work hard together towards enlightenment and nirvana.
Kawaguchi Hidetoshi Gassho