Materials, stock and accounting

Dear colleagues, perhaps this is not a relevant question here, I’m not an accountant but help me figure it out.

I purchase materials for production.
When purchasing, I use Purchase Order, Invoice, receipt. And the materials are put on the warehouse and displayed in the Trial Balance “Stock in Hand” category as “Debit” as an asset.
Pls explain to me what r the:
" Cost of Goods Sold"
Expenses Included in Valuation
and how appears Stock Adjustments”.

The issue has been resolved