My iPhone 12 Pro max isn't charging

One or more of the following possibilities:

• Defective power source
• Defective Lightning cable
• Dirt in the Lightning port on the bottom of the phone; carefully clean it with a non-metal tool such as a toothpick
• If charging it wirelessly, your case is too thick
• You used a really cheap charging cable that damaged the charging circuit in your phone

And posting the same question 3 times in 3 minutes won’t help solving the problem, and may annoy the other users in this forum that provide user-to-user tech support.