New players should focus on the in-game guide/wiki as this is the one that will always be kept up to date. But for the few ones still reading the forum guides, here are those that still have relevant information : (I'm not putting pinned topics here because they're already pinned)
Reworked holy skills list - Images are gone
Dimension of Souls - Even if this is lvl90-95 content, some parts of DoS can still be useful and later battle maps have similar mechanics
Farming Gold - Some parts about specific things have become deprecated like items that have now become lower lvl content or some prices, but it still gives interesting insights.
Farming Gold from dgn - An overview of some 0/10 dgn and how many gold they each give. Missing the more recent higher lvl dgns.
Awakening lvl125 weapons - The images are gone which makes it more difficult to read.
Guides for Starter Players - They are composed of :
Guide for Beginners lvl1 - Explanations on the UI, icons, tabs, stats, basic classes and basic quests
Guide for Beginners lvl92 - Explanations on crafting, higher lvl solo content, classes and gears
Gold Farming Guide - Mostly up to date to current meta
Recommended Classes - Explanations on beginner classes and gears for higher lvl content
Guild Towns - Explanations on guild and guild town system
Guide Couple-Spouse
Villa
Debuff guide - More advanced explanations on some beginner classes, gears and requirements for higher lvl content. It does overlap with Recommended Classes and misses more recent gears and dgn added to help new players.
Healer guide draft - This is more about explaining some healer classes' skills
Pet fusion
Abyss
Haven of Oblivion