Car Evolve Free Coins and Gems Earn the Codes

TL;DR: log in daily, watch your rewards, claim your missions and achievements, save your Gems for later, prioritize events, upgrade your lead car, watch out for official freebies, get involved with the community if you can, and avoid anything that tries to scam you. In addition, try to have a small routine to maximize your earnings without spending too much time, and maybe keep a small fund of Gems to prevent you from doing something stupid at eleven o' clock at night.