6+ digits
Avoid common patterns or personal info
Use non repeating numbers
Don’t reuse it on other devices
Discussion
if you intentionally avoid repeating numbers then you are weakening your PIN
a good chunk of random PINs will have repeating digits
a random number generator that never generates the same number multiple times in a row with a long enough sequence is a biased one
Makes sense. So just using a (truly) random number generator would do the trick. Good to know