I’ve been thinking about colors red, blue, green, yellow, purple, black, and white for the different groups of cards, what do all those colors means? I thought I knew before but now I’m not sure.
I'm not sure if you mean gameplay or lore so I wrote my thoughts on both to kill time
Red:
Gameplay: Red is all about getting rid of your opponent's security cards fast as possible. To do so, Red has the most DP boosting effects of all the colors, has many ways to stack on extra security checks, and is the best color at outright deleting opponent Digimon in order to clear a path to go straight to security.
Digimon usually found in Red: draconic digimon, digimon associated with fire, digimon found in volcanic environments
Blue:
Gameplay: Blue is about building your resources while limiting your opponent's resources. Blue's favorite way to do this is by adding digivolution cards to its Digimon and removing digivolution cards from your opponent's Digimon. Blue gives you high rewards triggered by your opponent having Digimon with no digivolution cards and Blue also likes to play its Digimon's digivolution cards as seperate Digimon. Blue is also the best color at unsuspending its Digimon (which usually allows you to attack twice) and is the best color at drawing cards and gaining memory through effects.
Digimon usually found in Blue: beast digimon, aquatic digimon, digimon found in cold environments, sky dragons or digimon related to them like Veemon
Yellow:
Gameplay: Yellow is a control color mainly focused on weakening the blows your opponent can dish out. Yellow likes to add cards to its Security while lowering opponent Digimons' DP and removing their security attacks, making it an ordeal to lower their security count. Yellow also gains high rewards from their own effects that are triggered by having their security stack at a specific count and they can also look at, draw from, and add to their security stack in order to better control what their opponent activates during security checks.
Digimon usually found in Yellow: primarily Virus Busters and holy digimon but also includes digimon associated with light, health, or electricity
Green:
Gameplay: Step 1: digivolve as fast as possible. Step 2: suspend as much of your opponent's Digimon as possible. And Step 3: delete your opponent's Digimon through combat. Green has the cheapest digivolution costs and effects that search the top cards of your deck for Digimon cards of specific levels in order to help ensure you have cards in your hand to digivolve into. Green also has tons of effects that suspend your opponent's Digimon and also gives you rewards for your opponents having suspended Digimon and effects that punish or remove from play your opponent's suspended Digimon. Green also has effects that reward you for deleting opponent Digimon in battle and surviving as well as effects that allow you to target unsuspended Digimon for an attack.
Digimon usually found in Green: Plant digimon, insect digimon, dinosaur digimon, and any digimon who live in nature heavy environments
Purple:
Gameplay: Purple is the high risk, high reward color. It will ask you to trash cards from your hand, a lot of times as a cost for a good effect, and will also give you powerful rewards at the cost of deleting your own Digimon in play. Purple also gains high rewards from their effects that are triggered by having the card types in their trash at or past a specific count and Purple can also play cards from their trash, essentially turning it into a second hand. Purple also incentivizes filling your trash with its signature <Retaliation> effect that has it so when a Digimon with <Retaliation> is deleted after losing a battle, you also delete the Digimon it was battling which is a fun way of giving Purple removal.
Digimon usually found in purple: primarily Nightmare Soldiers, evil digimon, demon digimon, undead digimon, and fallen angel digimon but also includes digimon found in dark environments or associated with magic or darkness as an element
Black:
Gameplay: Black's game plan is to always balance the amount of offense it has to its amount of defense. It has <Blockers> at every level and its Digimon with <Reboot> unsuspend during their opponent's turn, allowing Digimon they attack with to not be revenge deleted and even join their defense as another <Blocker>. Black gives its Digimon a lot of DP boosts, but it's usually only given during your opponent's turn or when the Digimon has a defensive ability such as <Blocker> or <Reboot>. Black also has the <Decoy> effect where if one of your other Digimon would be deleted by an opponent's effect, you may delete the <Decoy> Digimon to prevent that deletion. To make up for Black's slow and defensive gameplay is the powerful effect <De-Digivolve> which allows you to trash a stated number of cards from the top of one of your opponent's Digimon's stack unless it has no digivolution cards or becomes a level 3 Digimon. Black is also surprising in that its deletion effects can at times be on par with Red
Digimon usually found in Black: Metal Empire digimon, machine digimon, cyborg digimon, mineral digimon, puppet digimon, mutant digimon, failure digimon, artificial digimon, unknown/unidentified digimon
