How to use:

You can create a quick action using the /quick_action add <action-set> <trigger> <action> command.
You can either put a quick action in the general set or a custom set, putting it in general will make it always useable while a custom set trigger can only be activated when the set is equipped.
In the action argument you can write anything to send it to chat when the trigger is activated, or you could put a / behind it to run it as a command.
You can keep adding actions to a trigger by running the same command with a different action.

Examples:

- Give Item:

/quick_action add general .idk /give @s minecraft:crossbow[enchantments={multishot:10, quick_charge:5}, unbreakable={}, custom_name={text:"Cool Crossbow Ig?", color:gold, italic:false, bold:true}, rarity=epic]
To quickly give yourself a commonly used item without the need to type it out each time.

- Functions:

/quick_action add general .idk /function code:enemies/bosses/netherite_golem/summon
To quickly run long function names without needing to type them out.

- Teleport:

/quick_action add general .idk /tp @s 1467 65 2058
To quickly teleport to different places on a map you are working on.