Running Gear Essentials Guide

Help me build my running gear collection. Here's my situation:

Running type: [road, trail, both]
Climate: [hot, cold, variable, humid]
Typical distances: [short runs to long runs]
Budget: [tight, moderate, flexible]
Current gear: [what you already have]
Special needs: [night running, rain, etc.]

Please recommend:
1. Essential gear (must-haves)
2. Nice-to-have items
3. Seasonal gear for my climate
4. Safety gear recommendations
5. Technology/gadgets worth investing in
6. Gear for long runs specifically
7. Budget-friendly alternatives
8. Items to skip or avoid
9. How to layer for different temperatures
10. Gear maintenance tips