Some blind or partially sighted people are able to see certain colours, others can’t see any at all. You might have enough vision to see all colours, or maybe you can identify bright colours but have troubling telling blue and black apart.
It is important to learn about colours even if you cannot see them. You need to learn which colours look nice together, colours that clash, and about stripes, plaids, and other patterns. This is important for clothing, decorating your home, and providing context to the world around you. The colours of the sky, the ocean, and the leaves in autumn are just as important for a blind person to know as everybody else.
There are gadgets and apps that also make it easier for a blind person to identify colours.