An acknowledgement to @whatusernameshallihavenow for totally ripping about their thread for general misconceptions that persist. I've tried linking to the thread but I can't. Sorry.
I wondered which job specific myths there were (and hopefully thus avoiding brexit or covid).
Proofreader: You don't need any training as it's just checking spelling.
In my past life supply-teaching: supply teachers get paid more than 'proper' teachers. Prevalent view around here. I never, never understood it (or was working for the wrong agencies).