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Get a pair of Elytra from a flying Endermite

Enter the End

Get Nether Quartz from Bartering

Kill a Wither Skeleton for Coal

Craft a Lightning Rod to help in converting Pigs

Make an Iron Farm and get a full stack of Iron Ingots

Mine some Netherrack that generates with floating nether portals

Buy a Moss Block from the Wandering Trader

Get Soul Sand from Bartering

Buy some Pointed Dripstone from a Wandering Trader to Duplicate Lava

Enter the Nether

Build a Cobblestone generator

Craft a Cauldron to catch rain

Obtain Lava as a Gift from a Toolsmith

Obtain the Hero of the Village effect by defeating a raid

Make your first of many trades with a Wandering Trader

Trade for Emeralds

Cure a Zombie Villager using a Weakness Potion thrown by a Witch

Breed the first of many Pigs

Get a Silk Touch tool so you can move Grass Blocks easier

Kill a Drowned for Copper

Craft a Golden Apple

Mobs spawn faster lower in the world

Strike some Pigs with Lightning to convert them to Zombified Piglins, then kill them for Gold

Craft Bone Blocks from Bone Meal for Extra Fireproof Blocks

Make a Bed of the right color

Craft some Glowstone for lighting

Get some Redstone from a Witch

Kill a Witch

Get a Carrot or Potato from a Zombie and start a farm for breeding Pigs

Kill a Skeleton for its Bones

Kill the first of many Zombies

Start a Wheat farm

Kill a Spider for its String

Get a Water Bucket from a Full Cauldron

Kill Zombies to get Iron

Craft Bone Meal from Bones to grow trees faster

Crawl and place blocks on the bottom of top-side Trapdoors to build downward

Get your first Sapling to grow another tree

Get your first Log

Everything from Nothing