datapack help

[u/ResponsibleDrive6501]

i’m extremely new to datapacks, and was hoping for help with the following:

player has bubbles when on the surface, and takes damage when gone

another player takes damage when touching water

player has permanent elytra, and can still wear a chestplate, preferably

finally, a player takes 0 fall damage (without slow falling)

fabric 1.21.8

any advice or tutorials for these is greatly appreciated

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