The /etc/resolv.conf file is the main
configuration file for DNS resolution. Its format is quite simple. It is a
text file that has one keyword per line. There are three keywords
typically used by the file. These keywords are:
domain: This keyword specifies the local domain name
search: This keyword specifies a list of alternate domain names to search for a hostname
name server: This keyword, which may be used many times, specifies an IP address of a domain name server to query when resolving names
By default this file is set to:
nameserver 127.0.0.1 nameserver 192.168.1.254
You should not need to change it. The file, by default, shows the address of the local DNS server (192.168.1.254) provided by dnsmasq. dhcpcd won't override the address unless you implicitly allow it. Check the dhcpcd documentation below if you want to change that.