7 Wonders
Leaders, Cities, Armada, Edifice: in that order.
Ark Nova
Marine Worlds, then new zoo maps.
Azul
One true expansion, then a family of standalone games.
Carcassonne
Inns & Cathedrals, Traders & Builders, then chaos to taste.
Cascadia
Landmarks, and 5-6 players in the same box.
Catan
Seafarers, Cities & Knights, then the 5-6 trap.
Clank!
New boards for the base game, or the Catacombs line. Not both.
Dixit
Every expansion is 84 cards. Pick an illustrator, not an order.
Dominion
Prosperity and Seaside first, then the big boxes.
Dune: Imperium
Rise of Ix first. Uprising is a second base game.
Everdell
Bellfaire for players, Pearlbrook for pearls.
Final Girl
Core Box first, then pick a killer.
Great Western Trail
Rails to the North expands. The rest are new games.
Heat: Pedal to the Metal
Each box: two circuits and one more car.
HeroQuest
All quest packs need a base game. Order is mostly story, not power.
Istanbul
Mocha & Baksheesh, then Letters & Seals. Big Box = a second base game.
King of Tokyo
Power Up! first: every Monster Pack leans on evolutions.
Lost Ruins of Arnak
Leaders change every game. The rest is campaign and boards.
Marvel United
Expansions follow their core box. Heroes themselves mix.
Massive Darkness 2: Hellscape
Heavenfall for a campaign, enemy boxes for variety.
Memoir '44
Theaters bring armies. Battle Maps bring shopping lists.
Nemesis
New Intruders for the ship, or a whole new standalone game.
Orléans
Invasion, Trade & Intrigue, then The Plague if you dare.
Pandemic
On the Brink, In the Lab, State of Emergency. In that chain.
Rangers of Shadow Deep
Books in story order. You bring the miniatures.
Root
Riverfolk is not in the English base box.
Sagrada
Passion, Life, Glory. Seats come from a small kit.
Scythe
Invaders for seats, Fenris for a campaign.
Small World
More races and powers first, new boards second.
Spirit Island
Jagged Earth first, Nature Incarnate needs it.
Splendor
The 2017 modules are back in two boxes. Do not buy both versions.
Terraforming Mars
Prelude speeds the start. Everything else is to taste.
The Quacks of Quedlinburg
Herb Witches for 5 players, Alchemists for depth.
Ticket to Ride
USA, Europe, then Map Collections that borrow their trains.
Wingspan
European, Oceania, Asia, Americas: which one first.
Zombicide (2nd Edition)
Campaigns first, abomination packs for spice.