root servers + session-keyfile

I know In Bind 9.20.23 Stable version includes built-in root servers,
keeping the hint zone in the configuration remains best practice to
ensure it can be updated ?
1- I should create the zone "." into named.conf ?

zone "." IN {
        type hint;
        file "named.ca";
};

2- It's necessary to set session-keyfile ?
e.g. session-keyfile "/run/named/session.key"
I think 9.20.23 uses its standard (path+file), what do you think ?

thanks
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