How often should I realign the finder?
Check quickly at each observing session, especially after transport.
Should I align on the Moon?
You can, but a distant daylight object plus a bright star verification is more reliable.
Why does alignment drift after moving the mount?
Mechanical flex, screw tension imbalance, or loose finder bracket screws are common causes.
Red dot finder or optical finder for beginners?
Red dots are faster to learn; optical finders help in light-polluted skies with faint targets.