The thermistors do not have a polarity, but you must connect them to the right place.
The hotend thermistor connects to E0 TEMP
The bed thermistor connects to BED TEMP.
Re-crimping them with the proper locking connector will help ensure they are not easily pulled free.
Further information on thermistors can be found here on the wiki.
Connecting thermistors or PT1000 temperature sensors
Connecting PT100 temperature sensors
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