Markdown natively supports callouts. See the Obsidian documentation.
Types:
note
— pencilabstract
,summary
, ortldr
— clipboardinfo
— “i” symboltodo
— check marktip
,hint
,important
— firesuccess
,check
,done
— open check markquestion
,help
,faq
— question markwarning
,caution
,attention
— triangle attentionfailure
,fail
,missing
— X crossdanger
,error
— lightning boltbug
example
— bullet listquote
,cite