Just want to ask, how you guys handle crafting mundane and magic item?

I'm new DM, just stumble upon this while reading down time activities. I got confuse when I read DMG and XGE.

Quote from ShadowJoker767 >>

Just want to ask, how you guys handle crafting mundane and magic item?

I'm new DM, just stumble upon this while reading down time activities. I got confuse when I read DMG and XGE.

 The rules in the DMG and the rules in XGtE are not meant to be used together. It’s an either/or type of thing. The rules in the DMG are pretty garbage. Most folks I know use XGtE instead if they have that book.

Agreed, use the rules in XGtE.

Quote from IamSposta >>

Quote from ShadowJoker767 >>

Just want to ask, how you guys handle crafting mundane and magic item?

I'm new DM, just stumble upon this while reading down time activities. I got confuse when I read DMG and XGE.

 The rules in the DMG and the rules in XGtE are not meant to be used together. It’s an either/or type of thing. The rules in the DMG are pretty garbage. Most folks I know use XGtE instead if they have that book.

  ok noted, so I from one book only.... thanks

I got confuse again on crafting, this is from XGtE

Resources and Resolution. In addition to the appropriate tools for the item to be crafted, a character needs raw materials worth half of the item's selling cost. To determine how many workweeks it takes to create an item, divide its gold piece cost by 50. A character can complete multiple items in a workweek if the items' combined cost is 50 gp or lower. Items that cost more than 50 gp can be completed over longer periods of time, as long as the work in progress is stored in a safe location.

I already understand for crafting mundane item.
For example Plate Armor cost 1500gp. To craft it:
Cost: 750gp
Time: 15 workweek

i got confuse for crafting magic item since it gave a table for cost and workweek

To start with, a character needs a formula for a magic item in order to create it. The formula is like a recipe. It lists the materials needed and steps required to make the item.

An item invariably requires an exotic material to complete it. This material can range from the skin of a yeti to a vial of water taken from a whirlpool on the Elemental Plane of Water. Finding that material should take place as part of an adventure.

Magic Item Crafting Time and Cost

Item Rarity	Workweeks*	Cost*
Common	1	50 gp
Uncommon	2	200 gp
Rare	10	2,000 gp
Very rare	25	20,000 gp
Legendary	50	100,000 gp

*Halved for a consumable item like a potion or scroll

From what I understand is,  if my player want to craft clockwork amulet (common magic item), 

1. They need to find or buy the recipe that might cost around 50gp to 100gp
2. They need to gather the some ingredient (might be from plane of clockwork predictability)
3. Lastly they need only 1 workweek and 50gp to craft it

Am I correct?

Sort of. As far as I can remember, there is no fixed price for a “formula” to craft a magic item. So, if you decide to have it be something they can purchase or discover for an investment of 50-00gp, no problemo.

But maybe they have to go on a quest just to discover who knows the formula, and then they have to go in a quest to find that person, and then they might have to go on a quest for that person to get them to give the formula to the party. And then they still have to go on a quest to wherever to get the special ingredient to make the magic item.

That’s all up to DM discretion. How much or little they have to work up to that point is entirely up to you.

After that, then yes, it should only cost about 50gp and a week to make it.

For plate mail, wouldn't the selling price be 750gp? It is after all based on selling price, not buying price (you sell at 50% value). That would put crafting cost at 375gp and work week time at 7,5 weeks for plate mail.

Craftsmen would make a living if they had so spend half the item cost on raw materials alone. Rules are after all part of the world economy. 

When WotC writes “selling price,” they mean “sale price.” They never refer to the price at which something can be sold, only ever the price at which something can be bought.