Bu ne? Bu kim?
A0This is... / Who is this? - A0 Turkish lesson + practice
Bu ne? - What is this?
bu means this. Use Bu ne? when you want to ask what an object or thing is.
Bu kim? - Who is this?
Use Bu kim? for a person. Turkish does not need a separate word for is in these very simple sentences.
Ne? and Kim?
Bu / şu / o
For now, learn these three words as useful chunks. Bu is usually the thing close to you, şu points to something a little farther away, and o means that / he / she / it depending on context.