1. does car charger damage iPhone 6 battery?
2. what is the best,fast and safe car charger?
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howapple - hello
A cheap car charger can damage the battery. Get one that is certified as Made for iPhone. Griffin and InCase both make reliable car chargers. The Apple online store sells several others.
On thing to do as a precaution - do not start the car with the phone connected. Connect the phone after the car starts, because the starter on some cars can generate a voltage spike that can cause problems. A good charger should filter them out, but it's still a good precaution. (BTW, hybrid and electric cars do not have this problem).