There are a lot of things that happen by default in BuddyPress that you may have a need to change. For example the types of activities displayed in the activity pages, how many activity items are displayed per page etc. These things can be changed, but you will need to have some knowledge of coding, or be applying a code snippet that you’ve been given.
Very often with a BuddyPress site there is a need to make minor changes to the default behaviour of the site not supported by the available settings. Often these changes can be implemented using plugins but in a lot of cases what is required are small sections of code that you will insert into your sites files called Code Snippets.