There's a "help thread" for each flagship and the Nexus 5 has been unveiled yesterday!
- If you are starting on XDA please read this: XDA New User Guide
- And don't forget this: NO Best ROM/Kernel threads
N5 will be my first Nexus device thus I'll prolly post "clever" questions asap.
If you want to answer (even for a point of view) please answer gently and/or point in the direction where that user can find an answer and educate himself.
In Post 2 you'll find a few links that can be useful for general stuff.
Ask any question here: adb, fastboot, bootloader, specific apps, hardware, drivers...