Board Thread:Site Questions/@comment-35911608-20180622183933/@comment-24101790-20180622184424

The talk page is mainly a means of sending messages to other users. Think of it like someone writing something on your wall in Facebook. Similar premise.

The profile page is just an introductory/about page to let people who visit your profile get an idea of who you are.

Blogs are just blogs. A way of updating the community and addressing topics.