Tip: Start using NTS for NTP. Seriously, it only takes a few seconds to set up.
Discussion
Why?
NTP is unencrypted by default. While MITMing it is kind of funny, it's not really something you should leave your machine open to
Example NTP attack https://gist.github.com/Dbof/178cf3c4b9eee423b293c51380cd311b
Not being facetious there, I am absolutely immature enough to find MITM attacks funny