nAdd all the other data to your zone file.
nSome notes on notation.
uNote the fully qualified domain name including trailing dot.
uNote TTL and CLASS
localhost.secret-wg.org.
3600 IN A 127.0.0.1
bert.secret-wg.org. 4500 IN A 193.0.0.4
www.secret-wg.org. 3600 IN CNAME bert.secret-wg.org.