Ready /give Commands by Java Version
Working /give command for an enchanted Netherite Axe with Sharpness, Efficiency, and Fortune in Java 1.21.4 (up to 255) and 1.16.5–1.20.4 (1000).
Java 26.3 (item components, max lvl 255)
/give @p minecraft:netherite_axe[minecraft:custom_name={"text":"Thunder Axe","color":"#B8E66B","italic":false},minecraft:enchantments={"minecraft:sharpness":255,"minecraft:efficiency":255,"minecraft:fortune":255,"minecraft:unbreaking":255,"minecraft:mending":1},minecraft:unbreakable={},minecraft:attribute_modifiers=[{type:"minecraft:attack_damage",id:"custom_attack",amount:20,operation:"add_value",slot:"mainhand"}]] 1Java 1.21.4 (item components, max lvl 255)
/give @p minecraft:netherite_axe[minecraft:custom_name='{"text":"Thunder Axe","color":"#B8E66B","italic":false}',minecraft:enchantments={levels:{"minecraft:sharpness":255,"minecraft:efficiency":255,"minecraft:fortune":255,"minecraft:unbreaking":255,"minecraft:mending":1}},minecraft:unbreakable={show_in_tooltip:true},minecraft:attribute_modifiers={modifiers:[{type:"minecraft:attack_damage",id:"custom_attack",amount:20,operation:"add_value",slot:"mainhand"}]}] 1Java 1.16.5–1.20.4 (classic SNBT, up to lvl 1000)
/give @p minecraft:netherite_axe{display:{Name:'{"text":"Thunder Axe","color":"#B8E66B","italic":false}'},Enchantments:[{id:"minecraft:sharpness",lvl:1000s},{id:"minecraft:efficiency",lvl:1000s},{id:"minecraft:fortune",lvl:1000s},{id:"minecraft:unbreaking",lvl:1000s},{id:"minecraft:mending",lvl:1s}],Unbreakable:1b,AttributeModifiers:[{AttributeName:"generic.attack_damage",Name:"aether_attack",Amount:20d,Operation:0,UUID:[I;101,202,303,404],Slot:"mainhand"}]} 1For commands longer than 256 characters, paste the command into a Command Block (/give @p minecraft:command_block 1).