Chromosomes are the things you inherited from your parents. 23 pairs. 46 total. (like 23 pairs of socks) chromatids are the individual chromosomes in a pair (so like having two red socks, two blue socks. one red sock is a sister chromatid to the other red sock, and same with the two blue socks.) chromatin is the strands of DNA combined with proteins that make up the chromosome (the thread used to make the socks)
Chromatin fibres are thin thread like structure present in nucleoplasm if the nucleus. It is made up from DNA. As the nucleus takes part in cell division, It comes together to form thick chromosomes. However chromosomes are the things which are inherited i.e from the parents to the offsprings. There are 23 pairs of chromosomes and 46 in total