Basic effect command
A common Java Edition example is /effect give @p minecraft:invisibility 60 0 true. The target, effect ID, duration, amplifier and particle option control the result.
Popular effect searches
Players often search for effect generator Minecraft, effect command, Minecraft effect command generator, invisibility command, night vision command or resistance command. These can all be handled with the effect tool.
When it does not work
Check the edition, effect ID, target selector and duration. Bedrock and Java command formats are not always identical.