1. Edit / Delete product
On the admin sidebar, go to Catalog > Products.
Go to product grid.
To edit a product
On that product line, click Edit under the Action column.
To delete products
Select products to delete, then click on Action > Delete.
2. Edit / Delete category
On the admin sidebar, go to Catalog > Categories.
On Category page
To edit a category
Edit the category setting then click on Save to save the changes.
To delete a category
On the category detail page, click on Delete.