It's important to collect Lessons Learned notes during the project's run rather than trying to look back in hindsight and remember what happened after it's all over and done. Having a separate "Lessons Learned" section in a project notebook or documentation system is helpful for jotting down things to remember later for creating the LL.
Comments
This is vendor biased but I really like some of the groupings.
https://www.atlassian.com/blog/jira-software/5-fun-sprint-retrospective-ideas-templates
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