Custom Boss Bars (Simple) by cowmonster3

This is a SIMPLE tutorial on how to use /bossbar

/bossbar add [name] [name that shows up] (to make it)

/bossbar set [minecraft:name] player [player] (to show it to someone (do yourself to show it to yourself)

/bossbar set [minecraft:name] max [number] (this will be the max number that the boss bar can be)

/bossbar set [minecraft:name] value [number] (this will be the number that will show up as a progress bar)

that's the basics of this command, hope you liked this tutorial!