Carilah potongan jahe yang gemuk. Carilah jahe yang keras dan mulus. Pilihlah jahe yang aromanya tajam dan kuat.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Look for large pieces of ginger that are moist and heavy for their size. This will give you more ginger to work with.  Also look for pieces of ginger root that are straight and rectangular in shape, with as few bumps and knobs as possible. This will make them easier to peel and prepare. Ginger root can be frozen, unpeeled, for up to 6 months, so do not be afraid to buy more than you need for your current recipe. The skin of the ginger root should be firm and unblemished, apart from the rough, dr