Items or Blocks
CreativeMode Java mods are standard Fabric mods. The official and simplest path is to use Fabric (ideally via the CreativeMode Launcher). If you want to mix CreativeMode mods with Forge mods, you can use the Connector mod for Forge compatibility. This is not officially supported, but it is the best option if you want to use Forge mods with CreativeMode mods. Specifically, the Connector and CreativeMode only overlap for version 1.20.1.
.jar mods to the mods folder.See also: CreativeMode Launcher, Vanilla Launcher, Modrinth Launcher, CurseForge Launcher.