Sorry about this; but, it seems I am here to ask a question about every step in the process.
I'm using instructions at this web site and I have come across advice to use a utility at this site to create security keys similar to those below:
define('AUTH_KEY', '!OV_HDJ<q5#-:G@q 0hZFb/mN:SeMz$.a`&=U:}(8uGHv|pwrA}xJ A :-4ShfOl');
define('SECURE_AUTH_KEY', 'an|--ys+S{Xmuz5YoNs#=D@YgL-Sx}e=;6N09vn8T%C2P

B+^glAo0YKCHA3M).');
define('LOGGED_IN_KEY', 'ARfGKlsU/g|h

C662O}ON9Wdw;D7=/vQ@T7mau-F:Sv~zs&u|AC2lkSZQWN.&T5');
define('NONCE_KEY', '+|;C~vSVRy.mkIB--!>BA=5m46~qUug2#l(&GM%3|xJi{{.>SwM8(k)0xysC20`b');
define('AUTH_SALT', 'EC*d^)oDi^8fHc=l{]m#5s[!^613V+V]zGr%o{<d`n^SblJ5&?+kb`;~Sey&m_(A');
define('SECURE_AUTH_SALT', '+8+G4<zt3qVEERm^+fDTAvc6mM(9;vN?>t/<(8 ];iU;IB[}-FV.d[I1.CDQP-u5');
define('LOGGED_IN_SALT', '}6$c+x97J##=92VMcz7Q3-}qhXW75t^yZ3X0s0%T= o,P9j? 1YRDVn5:4]ibH+i');
define('NONCE_SALT', '--l)psUgJPds(_c3O9)-joo{z{;gR%!yx`@;$&aZ3c<RUGFfkP8|od}rMkaa|0>1');
This seems like massive overkill; but, what do I know who has never used WordPress so I'm here asking again.
I would rather use the same key for all lines and something I can remember if need be, something with a dozen or so characters.
Is there a compelling reason to use such long, keys that are impossible to commit to memory for a site that contains nothing valuable to anyone besides me?
Also, if I put keys in now, can they be changed later at will?