[Someone1234]

I used to also, until this blew up in my face.

Put random stuff as the security answers in my Trial World of Warcraft account in 2005. In order to merge it into my Battle.net 2.0 account around 2009 I needed to know it, and even though I had the correct password there was no way to change security questions and I had to beg customer support (which was a long process, involving software serial numbers, scans of ID, the whole works).

Ultimately they told me what my mother's maiden name was: qewqewdfskjr3924kjasdf

[bscphil]

I assume when people suggest putting random strings in these fields, it's implied that you're supposed to save that data in a password manager or something. Mine (KeePassXC) supports storing arbitrary data as "notes" in each entry, along with TOTP information (great as a backup in case you lose your phone), and other stuff.

I worry more that a particularly dull customer support agent is likely to be convinced by a random caller to reset the password if they can see that those fields are garbage.

[syntheticcdo]

Use randomly generated words. A CSR might be convinced by "idk I just put random words in there LOL" when the security question answer is uaisehf8wefjh0824m, but if they see "correct-horse-battery-staple" as the answer, it might be a bit harder to convince.

[checkyoursudo]

This is what I do, although like others mention I still use real words. I add my bogus answers to security questions as notes in my password manager. This method has worked well for me for a long time without any risk that I have discovered.