Gameplay guides (contains spoilers)

Guides published by Egosoft (patch notes are here)

Rebirth v1.25: features video.

Rebirth v1.30: Upkeep Missions video.

Rebirth v2.00: can guide is here.

Rebirth v2.50: Diplomatic Aid missions are explained in this video.

Rebirth v3.00: feature guide is here.

Rebirth v3.60: Flight Assist OFF guide is here.

Guides written on the forum (players and Egosoft)

A short screed on Pirating as a philosophy in X:R by Snafu (link).

Boarding Guide (detailed) by XenonSurf (link).

Boarding Guide ("boarding your first Titurel") by Snafu_X3 (link).

Boarding trick with Traitor drones ("XenonSparky Maneuver") by Sparky and XenonSmurf (link).

Campaign guide by Snafu_X3 and Sparky (link).

Capital ship guide for Rebirth 3.00 by Simoon (link).

Controlling where stations' ships travel by Sparky (link).

Crafting by Tamina (link).

Hacking hostile stations is here.

Harvestable resource locations in Rebirth 3.61 by Sparky (link; v3).

Hidden containers by Snafu_X3 (link).

Hidden ships by euclid (link).

Keyboard Command / Hotkey List by Ameer Nuub (link).

NPCs for hire by euclid (link).

Map for X Rebirth (including The Teladi Outpost) at seizewell.de (link).

NPC ships and Trade Reservation explanation by Burnit! (link)

NPC Skills and their use by Sparky and Snafu_X3  (link)

Quality of life tips by Sparky (link).

Reputation effects by Sparky (link).

Reputation with Teladi Outpost buccaneers (link).

Smalltalk and Trade Agent guide by Sparky Sparycorp and Snafu_X3 (link).

Snafu_X3's Guide to visually ID 'roid types is here: XRebirth forum link direct link: MS Word 2003 doc

Station building guide by Simoom (link).

Station Match Finder, for matching ware production and needs by EuRoKa (link).

Temporary Local Security IDs are discussed here.

The game world & engine by Sparky Sparycorp (link).

Zloth's Guide to all things in Rebirth v3.50 is here.

Waervyn's miscellaneous video tutorials for v3.61 are here.