How to use bbcode in flarum

If I get any bbcodes or markdowns, I'll definitely include it here.

[b]Hello world[/b]

Hello world!

[i]Hello world![/i]

Hello world!

[size=50]Hello world![/size]

Hello world!

FYI: I could not include code because it conflicts with another code bbcode.

Here you can find all bbcodes supported by the parser used by Flarum http://s9etextformatter.readthedocs.io/Bundles/Forum/#bbcodes

I think most of them are enabled by default. Other features from the parser can be enabled by extensions (example: media embed)