This is my 2nd blog. I also think this is a pretty cool blog, so allow me to present my second blog:
How to get held item effects

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by super_boov

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Same here, there are a few steps to this:
1. get a command block(in case you didn't see how in my last blog or don't know how: type /give @p command_block)
2. place it down.
3. set it to repeat, unconditional, always active
4. (i'm going to use a feather, so the SelectedItem is "minecraft:feather". also, i'm going to use feather falling so, the effect is minecraft:feather_falling) Type in the command block: execute as @a[​nbt:{SelectedItem:{id:"minecraft:feather",Count:1}}] run effect @p minecraft:feather_falling 1 1 true
5. this isn't really a step, but you can execute multiple effects by typing the same command in chain command blocks attached to the repeating one, just a different effect.
THANK YOU FOR READING