Warning: Time dilation is a serious business. Don't get caught in the vortex.
1. Always wear your seatbelt while time-traveling. We can't stress this enough.
2. Keep your time-dilation device well-maintained. Regularly update your chrono-circuits and perform routine temporal calibrations.
3. Don't eat anything that's been sitting in the timestream for more than 30 minutes. It's just not worth the risk.
4. Never, ever, ever try to dilate your way out of a speeding ticket. It's just not worth it.
5. When encountering alternate timelines, do not attempt to make small talk. Trust us on this one.
Additional resources:
Timeline Synergy: The Art of Inter-Timeline Communication
Time Lord Certification Program: Because Safety Should Never Be Optional