meaning of the tags in DKIM signature

When setting up DMARC, we have to set up DKIM first. Google Workspace makes it easy. But I was curious to know what exactly the tags mean in the DKIM header. From
https://help.returnpath.com/hc/en-us/articles/222438487-DKIM-signature-header-detail

v = version

a = algorithm of the hash

h = hash

s = selector record name in DNS

d = domain used with the selector s

b = hash data (body)

bh = computed hash of the message body

h = list of headers used in the hash algorithm

t = timestamp of the hash

x = expiry time of signature

c = canonicalization algorithm in case mail server makes minor changes

i = identity of user or agent