A few (too) simple questions about DNS records

[Yanek]

Hello list,

These questions are a bit too obvious, still my searches and queries
gave me various results. Please bear with me.

1/ What is the bind record format for the zone itself? So far, I thought
it was something like:

mydomain.tld.                                 IN      A       1.2.3.4

Am I wrong?

2/ What is the bind format for a SPF record, eg:

mydomain.tld.                                 IN      SPF     "any text
policy here, like: v=spf1 a mx ptr -all"
or
mydomain.tld.                                 IN      TXT     "any text
policy here, like: v=spf1 a mx ptr -all"

or anything else?

3/ What is the bind format for a DKIM record, eg:

_domainkey.mydomain.tld.                      IN      TXT     "any text
policy here, like: o=~;r=user at mydomain.tld"
selector._domainkey.mydomain.tld.           IN      TXT    
"v=DKIM1;p=SoMEveRyLongKey;"

or something else?

Thanks by advance :)