Please add links as necessary. This is a community repository. If something is broken or changed, fix it.
Is Valtan and/or Avesta up? This page will tell you.
Website for Lost Ark content. Island names may be different. Contains interactive maps that help identify quests, mokoko seeds, and adventure book completion items. Also contains guides for upgrading ships, collecting Island Hearts, gold sources as well as all the other collectibles.
Another great resourch for finding build guildes and other hidden treasures.
Saintone's Lost Ark guide (KR-specific, but lots of useful information): https://docs.google.com/document/d/1oci4R6IkwiQoVhGH8IHwFIS33dVS7hQv2Z-sljRrmcE/edit#
A very in-depth class specific leveling guide
Save yourself a copy in your Drive for quicker access!
Guide for quests that give engravings
A reward guide for upgrade materials and quest rewards
Here is another Island reward guide.
Comprehensive checklist with daily/weekly tracker
Fresh 50 to T3 Infographic
Grinding map for adventure book materials
Twitch drops, free rewards for leaving a stream running.
Ability Stone Facet Calculator