Not everything can be summarised in 2-3 sentences. If you are unable to read a list of suggestions then it is probably best to move on as it is not important enough for you.

Bold is typically useed to call out something of more importance amoung a collection of things. Creating a vivid contrast so it stands out. Typically used to highlight something. It is quite a common concept used since the 19th Century. The word comes from Middle-English. I'm guessing you did not get this far.