Items are…well…ITEMS, that can be used to place a block or do many other things. For example, the Elytra is a wearable item with durability. Items can also be craftable. See crafting for more info. The difference between blocks and items is that items are usable and mostly craftable. Blocks cannot be usable in hand.
Tools are craftable (using a crafting table) and also used to mine blocks. But it comes with a cost- durability. Each tool has durability, with golden having the least durability and netherite having the most. In Java edition, in older versions, you could enchant golden tools up to 25 times. Also gold tools are more efficient. To make netherite ingots, it got a lot harder in 1.20.1 (Trails and Tales update). You need to find a smithing template in a bastion and use it in a smithing table with a diamond. But fortunately, since mojang created the duping recipe, you only need 1 in general. Here is the crafting recipe:

To craft tools, you need this recipe:




This image helps you visualize How to make tools and how to get a crafting table and stuff:

Netherite tools are different: they need diamond tools to create netherite ones.

There are also special tools, that cannot be crafted, and only drop from mobs. So far, the trident, has the swing rate of an sword and the power of a stone axe. It’s also durable, also it is throwable. It can even be enchanted. Note that tridents can still break. A trident can be enchanted with loyalty, riptide, impaling, or channeling. Channeling introduces the chance, on impact with a mob, the chance of thunder striking it, this can only happen in a thunderstorm. If a block is in the thunder’s way, the lightning attack will automatically fail. Impaling is just another variant of sharpness but with tridents. Riptide lets you get “thrown” with the trident either in a rainstorm on standing midst water, even if only your legs are in the water. Loyalty automatically returns the trident to the corresponding player who threw it. Tridents only drop with a 1% chance (about) of killing a drowned.
Shields are special because they can block most attacks by holding the shield in the offhand and crouching. The crafting recipe is:

The brush can be used on suspicious sand, to get many different types of items and blocks. It can still break. To make the brush, its relatively easy. Left click on a crafting table, on the top of the grid, place a copper ingot with a stick under it, with a feather under that item. It doesn’t matter where the first item is placed on the grid.
Turtle shells give you breathing underwater for 10 seconds, every time you dive into the water, and this effect is not temporary, as it gives you 10 more seconds of breathing underwater every time you get fresh air and swim in the sea. They can be made by the helmet recipe, but you need to replace the blocks with scutes. They are only obtainable through breeding turtles with seaweed.
Elytra are found in end ships, which are in the End island. It is only obtainable once you beat the ender dragon. Elytra enables you to fly until you hit the ground once equipped in the armor GUI. This happens when you press W twice in a row. It is repairable by mending (I think).
Flint and steel is made when placing on your crafting grid, flint, which has a chance of dropping instead of gravel when mining gravel, and placing diagonally to the item a iron ingot. It is used to light things like nether portals and other blocks, and defies the blocks being flammable. The only thing with un-flammable blocks is that it doesn’t (and cannot) destroy the block.
Axes are special in Java edition. They do extra damage, but its swing speed was buffed. Most people take advantage of the damage by critical hitting mobs. Critical hit doubles the damage of your hit when hitting a mob in midair. But they can still be usable to destroy blocks in Bedrock edition.
Swords have a high DPS (Damage per second), and they also have a Sweep attack in Java edition. In Java, if the player’s recharge bar and is not sprinting, the player performs a sweep attack, attacking multiple mobs in front of the player. Swords can also mine cobwebs.
Pickaxes mine underground blocks, like stone. They do not have any other function, only mining blocks is the only thing it can do. It does not have any other usage.
Hoes only create soil blocks out of dirt, it literally does nothing else.
Leather armor is only obtained by killing cows, Which have a chance to drop leather, and to craft it, you must use the same armor recipe but replace it with leather.
Speaking of armor, here are some crafting recipes for armor (does not include netherite because I told you already how to craft it, same thing for leather, and chainmail armor is only found in structures.):



Unfinished website, please don’t get angry that it’s not finished.