Look out for urea, lactic acid and lecithin. Balsam is a resin that stiffens hair to add volume, which explains why conditioners containing it are the best sellers. Panthenol, vitamin B5, unlike most vitamins, does penetrate hair and is essential for strength and healthy growth. Protein shampoos do not penetrate the hair but they cot it thus providing more bulk. A protein shampoo acts similar to a shampoo and conditioner in one.
Silk helps to make hair appear shiny by coating the hair and reflecting the light.
Jojoba is a richly moisturising oil so is great for dry and damaged hair, but it's also very expensive and the amount found in conditioners may be minimal. In fact probably just enough to put it on the label. You can see how many different ingredients can be added to conditioners and shampoos to help take care of the hair. You should try and find the one that suits your own hair type and not just buy one because the manufacturers say it is the best, everyone's hair is different. Choosing the correct shampoo and conditioner for your hair can be a matter of trial and error.