I'm not sure what you are asking here but phpBB is based on template system, if you know HTML and CSS it can be endlessly customized including the header and footer.
BBcode is common in many web applications like forum software, it's used to format posted text. If you are viewing posting pane the default ones are the little buttons on the top left of pane. The B button for example produces bold text.
That will produce this:
Another example is lists:
Code: Select all
[*]List Item 1
[*]List Item 2
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison