sk勉強する時に分かりやすいサイトとかおすすめあったら教えてください

function giveItem() :: item:
  add all items to {_items::*}
  remove stationary lava from {_items::*}
  remove barrier from {_items::*}
  remove command block from {_items::*}
  remove bedrock from {_items::*}
  remove flowing lava from {_items::*}
  remove powered redstone repeater from {_items::*}
  return random element out of {_items::*}

function giveItem() :: item:
  add all items to {_items::*}
  remove stationary lava from {_items::*}
  remove barrier from {_items::*}
  remove command block from {_items::*}
  remove bedrock from {_items::*}
  remove flowing lava from {_items::*}
  remove powered redstone repeater from {_items::*}
  return random element out of {_items::*}