People give themselves too much credit for what they do well and give external forces too much blame when they fail refers to the self-serving bias.

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The self-serving bias is a cognitive bias where individuals tend to attribute their successes to internal factors (such as their own abilities, efforts, or personality traits) and their failures to external factors (such as luck, circumstances, or other people's actions). This bias can cause people to give themselves too much credit for what they do well and give external forces too much blame when they fail.

People Give Themselves Too Much Credit for What They Do