The one I see a lot is that JFK was assassinated because he wanted the US to print its own currency and get away from federal reserve notes.

This was debunked by G Edward Griffin.

If people don't know who he is, he's a staunch critic of central banks and fiat currency, author of "The Creature from Jekyll Island" that exposed the creation of the Federal Reserve, and the guy who gave a famous lecture for the John Birch Society that everyone should watch.

Here's the TL;DR of JFK's executive order:

https://freedomforceinternational.org/jfk-and-the-federal-reserve/

Therefore, my statement in The Creature from Jekyll Island is correct. EO 11110 did not order the printing of Silver Certificates. It ordered the amendment of a previous executive order so that the United States Code would authorize or “empower” the Secretary of the Treasury to issue Silver Certificates if the occasion should arise.

The occasion did arise between January 1963 and October 1964 with the issuance of 768 million of the 1957B Series, which carried the signatures of Kathryn O’Hay Granahan and C. Douglas Dillon. This was the smallest issuance since 1935, and it was the last. (See “Silver Certificate” at http://en.wikipedia.org/wiki/Silver_Certificate.)