The phrase "past mistakes" refers to errors or wrong decisions that a person made in the past. It indicates things that were done that turned out to be wrong or caused problems. Full definition
We all tend to learn from past mistakes how to do things better. (cnbc.com)
I support charter schools and career academies as part of a broader education ecosystem, provided we are being mindful of past mistakes around gender, ethnicity and income bias. (cobbchamber.org)
Moreover, the collaboration moves the spouses forward, and does not place blame for past mistakes. (divorcesource.com)