vBulletin supports a wide array of BBCodes and custom tags. While not a full list, I'll outline some of the most useful ones here. And remember that at any time you can click the Advanced Editor (the A next to the Smiles icon) and do most of these things with a click of a button.
Usage:
The above codes will either bold your text, italicize your text, or underline your text.
The above code will create a numbered list like so:
The above code will add a named link (url) to your post, like this - The SyTy Registry Forums!
The above code will produce an embedded image, like so: 
The above code will embed a video into the post, like so:
For a full list of codes, please visit - https://www.bbcode.org/
Usage:
HTML Code:
Bold = [b]Bold - Bolds your text[/b] Italics = [i]Italics[/i] - Italicizes your text Underline = [u]Underline[/u] - Underlines your text
HTML Code:
[list=1][*]Buy a SyTy[*]Buy a set of jackstands[*]Boost launch your truck[*]Use jackstands[/list]
- Buy a SyTy
- Buy a set of jackstands
- Boost launch your truck
- Use jackstands
HTML Code:
[url=http://sytyregistry.com/forum/]The SyTy Registry Forums![/url]
HTML Code:
[img]https://s3.amazonaws.com/ccco/uploads/attachment/image/file/7653/0_1_low_res.jpg[/img]

HTML Code:
[video=youtube;JBJ4Wp92t7Y]https://www.youtube.com/watch?v=JBJ4Wp92t7Y[/video]
For a full list of codes, please visit - https://www.bbcode.org/