I want to move In stock and SKU above the Add to cart button how can I do that?
You can dot this by moving of the element
product.info.stock.sku by overriding
catalog_product_view.xml file in your theme.
<move element="product.info.stock.sku" destination="product.info.main" before="product.info.addtocart"/>
Also, run deployment commands after the changes.
Hope it helps!!!