From LOTR-TCG Wiki

Interaction is an informal game term with two separate meanings.

An interaction is the way two cards work together. Oftentimes, this refers to combos: for example, Rapid Reload (15U89)LOTR-EN15S089.0 card.jpg and (two or three copies of) Demoralized (11U114)LOTR-EN11S114.0 card.jpg interact to create a loop that allows you to exert all of your opponent's companions until they are exhausted. Cards can also interact in opposed ways: Slaked Thirsts (7U14)LOTR-EN07S014.0 card.jpg can protect your dwarves from Gríma, Wormtongue (4R154)LOTR-EN04S154.0 card.jpg. Here, the interaction is that Slaked Thirsts can exhaust Grima before he has a chance to interfere with the cards borne by your dwarf.

Interaction can also refer to the ability of card, strategy, or deck to interfere with your opponent's gameplan. A deck using Ithilien Blade (15C62)LOTR-EN15S062.0 card.jpg or Stewards’ Legacy (13U75)LOTR-EN13S075.0 card.jpg can often proactively interfere with the Shadow player's ability to execute their gameplan at all. This usage is rare in LOTR TCG, but common in other games with more abilities that interrupt the opponent's turn, such as in the Magic: the Gathering community.

Game Setup Starting FellowshipBiddingMulligan
Deck Building Considerations UniquenessX-ListR-ListErrataFormat
General Strategies BeatdownBombCorruptionDirect Wounding/Undirected WoundingHand ExtensionRun/StopSkirmish CancellationSwarmWin ConditionWound Prevention
Deck Archetypes Auto-Corruption BombBeasterlingsElventsForestgulsHobbit HospitalFruit LoopsGondor KnightsGondor RangersGondor WraithsMoria ArcheryMoria BeatdownMoria NavyMoria SwarmMoria TentaclesNazgul BeatdownNinja GollumOrc CorruptionRainbow WoundingSauron GrindSauron InitiativeSauron RoamingSauron ThreatsSolo SmeagolSouthron ArcherySouthron InitiativeStupid SwarmSuper FriendsTelepathyThreatgulsToken TanksTroll SwarmUruk ArcheryUruk MachinesUruk TrackersWarg Super Swarm
Rules Rule of 4Rule of 9
Mechanics BearDiscardDraw DeckExertExhaustedFellowshipInitiativeIn Play/Leave PlayMove LimitReconcileRoamingSite ControlSpotStackSupport AreaThreats
Gameplay Terms BoatBodyBroken/NPE/OPBuff/NerfChokeChump BlockingComboCultural EnforcementCyclingDead DrawFatFilterFloodGasGlueGrindHand ClogHateInteractionLoopMatchupMetaMillNewbie TrapNukePilePower CreepPumpRainbowRecursionRemovalResourceRogueRule of 6SideSite ManipulationSplashSubcultureTankTutor/DownloadValue EngineWhiff