The second one costs you money
Inner ways are passive upgrades that improve your stats and can change how your weapons or combat mechanics work. 0:20 You equip four at a time. 0:37
Every inner way is either tied to a or is , and falls under attack, defense or support.
That path/universal split looks cosmetic and isn't. It sets what a note recycles for, and it decides whether converting later gains you 50% or loses you 33%. Section 04 is entirely about that.
What this guide does not tell you
Which specific inner ways are good. The source video's advice is structural — primary weapon first, then high-uptime buffs — and it never names a single recommended inner way. Anyone giving you a list is drawing on something other than this video.
What to do with that
Take your primary weapon's inner way to tier 6 first, as the video says. For everything else, understand that stopping at tier 4 is a real option costing a quarter as much.