Reddit mentions of Sekiro Shadows Die Twice, Official Game Guide

FuturePress Sekiro Shadows Die Twice Official Game Guide

Well worth the price and the wait (ordered the first week of March). Freaking 592 pages long, in-depth analysis on every aspect of the game with some sweet art to boot.

Link if interested: https://www.amazon.com/gp/aw/d/3869930942?psc=1&ref=ppx_pop_mob_b_asin_title

This is typical of FromSoftware games: the lore is obfuscated and you need to remember what you do and what you need. Most dialogue will telly you what to either do or get but you have to remember it and there's no marker for the next quest update.

Fortunately, there is a wiki which contains all the quest lines and the conditions under which they happen. Many players will suggest you do your first play through blind and only seek help for NG+. You do need at least one NG+ cycle to get all the trophies.

Note that the two "easy" endings are doable by just following the main plot. Any additional endings need a little more preparations. As for quest lines, none of them have good or bad endings, just mostly bitter sweet.

Of course, there's the guide as well… which is really worth it.