How is DNA structured, osea how are the different parts of a nucleotide bonded between themselves, and how is one base bonded to another one? What's the difference between RNA and DNA?

The bond between the phosphate group, pentose sugar, and nucleotide base is covalent. The phosphate group of a nucleotide bonds with the pentose sugar of the next through covalent bonds too. However there is a hydrogen bond between the nucleotide bases; 2 between adenosine and thymine and 3 between cytosine and guanine. Also note that there are two strands of DNA and they're antiparallel. RNA is single stranded and has ribose instead of deoxyribose as nucleic acid