Reddit reviews Maimonides' Introduction to the Talmud: A Translation of Maimonides Introduction to His Commentary on the Mishna With Complete Original Hebrew Text

Temurah 16a:

שלשת אלפים הלכות נשתכחו בימי אבלו של משה אמרו לו ליהושע שאל א"ל (דברים ל) לא בשמים היא אמרו לו לשמואל שאל אמר להם אלה המצות שאין הנביא רשאי לחדש דבר מעתה

Three thousand halakhoth were forgotten during the period of mourning for Moses’. They said to Joshua: ‘Ask’; he replied: It is not in heaven. They [the Israelites] said to Samuel: ‘Ask’; he replied: [Scripture says:] These are the commandments, implying [that since the promulgation of these commandments] no prophet has now the right to introduce anything new.

Whether we are to take this aggadata literally or not, the message is that while the Oral Torah does definitely communicate content, it more importantly communicates a system. Yes, the Talmud records debates over unsettled issues and eventually the law is decided in accordance with one side. This is all in accordance with the system of Oral Torah transmitted at Sinai. We don't look directly to heaven for a halakhic decision, we don't look to a Prophet who may not issue new law - rather we look to the system of Oral Torah. If you would like to have a firmer grasp of the different elements of the Oral Law, I suggest studying Maimonides introduction to his commentary on the Mishnah. You can find it available in Hebrew here, or purchase a translation.

https://www.artscroll.com/Categories/PBK.html

https://www.artscroll.com/Categories/BL1.html

You should know that we have an extensive Oral Torah that will not be covered by those two books. A good start might be "Jewish Literacy" and "Maimonides' introduction to the Talmud"

Maimonides' Introduction to the Talmud
https://www.amazon.com/dp/1880582287/ref=cm_sw_r_cp_apa_1-kMAbSZ4RGZJ

This book outlines the rambam's legal method and definitions. It's basically why I consider myself a rambamist.