Here's some basic ones for you:
Just get rid of the spaces in the following bbcodes.
Image: [ img]insert image link here[/ img]
Bold: [ b][/ b]
Italic: [ i][/ i]
Underline: [ u][/ u]
Strikethrough: [ s][/ s]
Center: [ center][/ center]
Hyperlink: [ url= https:// Example Text .com ] Link [/ url]
Font: [ font= insert font here][/ font]
Font size: [ size=][/ size]
Font colour: [ color=insert colour here][/ color]
Spoiler: [ spoiler=][/ spoiler]
Forum Writer's Color ReferenceForum Writer's Font ReferenceIf you're interested in a specific one I haven't mentioned then feel free to ask. Hope this helps!