Fantasy baseball has traditionally been scored in one of two methods - Points and Categories. These two popular scoring systems have dominated fantasy baseball, with categories being the most popular and most widley utilized of the two. Categories style selects certain categories and assigns "category points" based on team rankings in those categories. Points leagues adds to a total Points score with each selected statistical category being worth a certain number of points. For example, in a Points league a Home Run might be worth 4 points. In a Categories league, winning the Home Run category might be worth 12 category points (or 1 Category point if head to head matchups with the loser getting 0).
To explain in further detail, a hypothetical 4-team Category league might be scored like this for the Home Runs category:
Home Runs Points