Install and first run · Docs

Install it with the CurseForge app (search for Polestar Guides (opens in a new tab)), then skip to step 3. Or download Polestar-<version>.zip from the newest release on the Releases page (opens in a new tab), under Assets (not "Source code").
Unzip it into the game's AddOns folder, so the Polestar folders (Polestar, Polestar_Guides, Polestar_QuestDB, Polestar_ItemDB) sit directly inside it: World of Warcraft/_classic_beta_/Interface/AddOns/ on the beta client, _forever_ instead of _classic_beta_ from launch.
Restart the game completely (a /reload does not load new addons) and log in. The guide window opens with a guide for your race, level and zone: follow the arrow, and the goals tick themselves off as you play.

Good to know:

/polestar guides opens the hub: every guide, Lookup, Dungeons and Rares. /polestar options holds every setting; quest markers on the map are off until you turn them on under Map.
/polestar skip moves on for good; /polestar next and prev only look ahead or back.
Updating:delete the old Polestar folders, then unzip the new release the same way.
Memory:the arrow's walking routes (Polestar_Nav) load after login, never in combat: about 34 MB for the walking maps, and while a walk is being searched up to about 45 MB more for the stretch of map it crosses, released when the search ends. Walk real paths (Options, Arrow & routes) off never loads them.
Optional:Polestar_Recorder-<version>.zip from the same release records your sessions to improve the routes. It does nothing until you turn it on.
Community guides are other people's guides for Polestar, each a separate addon from its own author: see Community guides.
Something wrong? Click the bug in the guide window, beside Skip: say what went wrong, copy the report (it already holds the step, where you stand and the versions) and paste it on the Polestar Discord (opens in a new tab). /polestar report opens it too, and issues (opens in a new tab) are welcome as well. The release's SHA256SUMS holds the zips' checksums.