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Writing Tests for Existing Code
Check the book "Working Effectively with Legacy Code": amazon.com/Working-Effectively-Legacy-Michael-Feathers/dp/…, Michael Feathers suggests to write the tests before modifying any legacy code.
How far can I push refactoring without changing external behavior?
If you want to learn more, this topic is also an active research field. There are many scientific publication on this topic, e.g., informatik.uni-trier.de/~ley/db/indices/a-tree/s/…
How do I deal with a slow and undedicated colleague in the team?
+1 for stressing that "behaving professionally is the single most important thing for your long-term career".