How do errantists distinguish the parts of the Bible that are trustworthy from the parts that have errors?

How do errantists, i.e. Christians who reject the doctrine of Biblical inerrancy, distinguish the parts of the Bible that are trustworthy from the parts that have errors? How do they know which parts have errors and which parts are trustworthy and authoritative? ___ Related: https://christianity.stackexchange.com/q/92924/50422