Add additional info (brand name) on productpage woo commerce

I wan’t to put additional info to my product page on my woocommerce site, but I can’t figure out how to do that.
Some forums say, I have to add some data in the functions.php of my theme, and others say that u have to put the data in the content-product.php.
Where can I add that data. I want to add SKU and Brand Name.