Answer:
My first half means container. Not a lot of people understand my language. What am I?
People buy me to eat but never eat me. What am I?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.