Read "The Curious Case of William Baekeland", a book by about a real con artist (scammed multiple hardcore travelers by pretending to be an heir to a rich family). He was uncovered due to multiple OPSEC failures.
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I've experienced an OPSEC failure myself last year, when I unintentionally disclosed the existence of Pixel 4 before its release, and indirectly ended up being in a Forbes article. OPSEC is hard :)
forbes.com/sites/gordonke
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has a collection of OPSEC-related reading materials. Can also recommend his talks on Youtube on the topic.
grugq.github.io/resources/