**Commands**: git restore <file> (unstaged); git restore --staged <file> (staged); git reset --hard HEAD (all). git stash for reversible save.
**Why Care**: --hard is destructive; in CI/CD use git clean -fd for untracked. Never --hard on shared branches without alignment.
**Pro-Move**: Always git status; git diff before discarding....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Verizon. The answer also includes follow-up discussion points that interviewers commonly explore.
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