Create registers new Tags which can be added to blocks, items or fluids using datapacks or packdev tools like KubeJS.
Some of them expose special behavior within and/or outside the mod.

Block Tags

• create:brittle
  Blocks that are connected to others
  Example: Doors, bells, value handles
• create:copycat_allow
  Blocks which players should be able to use in copycat blocks
• create:copycat_deny
  Blocks which players should not be able to use in copycat blocks
• create:fan_transparent
  Blocks which will not stop air flows from fans, no matter the voxel shape
  Example: Iron Bars
• create:girdable_track
  Track blocks that support having girders at under them via the offhand placement system
• create:movable_empty_collider
  Blocks which should be able to move on contraptions, but would otherwise be ignored due to their empty collision shape
  Example: Cobweb
• create:non_movable (forge:relocation_not_supported also works)
  Blocks which cannot be moved by contraptions
• create:non_breakable
  Blocks which cannot be broken by drills and saws
• create:passive_boiler_heaters
  Blocks which can provide passive heat to the steam engine multiblock. Not as strong as active Blaze Burners
  Example: Campfire
• create:safe_nbt
  Blocks tagged safe_nbt will keep their nbt data when printed by a Schematicannon
  Example: Banners, Signs
• create:tree_attachments
  Blocks which should be harvested as part of a tree when cut by a Mechanical Saw
  Example: Mangrove Propagule
• create:windmill_sails
  Blocks which can count toward a functional windmill structure
  Example: Wool
• create:wrench_pickup
  Blocks which can be broken and collected very quickly using a Wrench (Sneak-Right-Click)
  Example: Rails, Various Redstone components
• #create:chest_mounted_storage and #create:simple_mounted_storage
  For simple mounted storages
• #create:fallback_mounted_storage_blacklist
  Blocks which shouldn't fallback to the fallback mounted storage handler
• create:roots
  Tree root blocks which should be harvested as part of a tree when cut by a Mechanical Saw
  Example: Mangrove Roots
• create:sugar_cane_variants
  Sugar-cane like blocks that can be harvested by the harvester
• create:non_harvestable
  Blocks that should not be harvested by the harvester

Fan processing block tags:

• create:fan_processing_catalysts/blasting
  Blocks which fans will consider as catalysts for blasting via fan processing.
• create:fan_processing_catalysts/haunting
  Blocks which fans will consider as catalysts for haunting via fan processing.
• create:fan_processing_catalysts/smoking
  Blocks which fans will consider as catalysts for smoking via fan processing.
• create:fan_processing_catalysts/splashing
  Blocks which fans will consider as catalysts for splashing via fan processing.

Item Tags

• create:blaze_burner_fuel/regular
  Items which do not have "burn time" for furnaces, but should act as food for the blaze burner (same value as coal)
• create:blaze_burner_fuel/special
  Items which upon being fed to blaze burners should cause them to be superheated (same value as blaze cakes)
• create:upright_on_belt
  Items which should render standing up on belts or depots, much like fluid container items
  Example: Blaze Cake
• create:pressurized_air_sources
  Items which can provide air much like a Copper Backtank. Uses the "Air" value in its nbt data to operate

Other Tags are added and used primarily for crafting recipes and or advancements:

• create:casing
• create:create_ingots
• create:crushed_ores
• create:modded_stripped_logs
• create:modded_stripped_wood
• create:vanilla_stripped_logs
• create:vanilla_stripped_wood
• create:sandpaper
• create:seats
• create:sleepers
• create:toolboxes
• create:valve_handles
• create:tracks

Fluid Tags

Bottomless tags:

• create:bottomless/allow
  Fluids which can be drained infinitely using a hose pulley. Requires config to be in allowlist mode
• create:bottomless/deny
  Fluids which cannot be drained infinitely using a hose pulley. Requires config to be in deny-list mode

By default, configs are set to allowlist mode, and only water and lava are tagged bottomless/allow

Fan processing fluid tags:

• create:fan_processing_catalysts/blasting
  Fluids which fans will consider as catalysts for blasting via fan processing.
• create:fan_processing_catalysts/haunting
  Fluids which fans will consider as catalysts for haunting via fan processing.
• create:fan_processing_catalysts/smoking
  Fluids which fans will consider as catalysts for smoking via fan processing.
• create:fan_processing_catalysts/splashing
  Fluids which fans will consider as catalysts for splashing via fan processing.

Entity Tags

• create:blaze_burner_capturable
  Entities which can be captured by blaze burner cages
• create:ignore_seat
  Entities which should not sit in seats