My charger looks good but my phone is not charging

Try wiping the tip of the cable. (Where it plugs in to the iPhone) and try blowing out the charging port on your iPhone. And just in case of internal damage on the cable, try a different lightning cable if you have one.

good luck!

-Alex

These alerts can appear for a few reasons: Your iOS device might have a dirty or damaged charging port, your charging accessory is defective, damaged, or non-Apple-certified, or your USB charger isn't designed to charge devices. ... Remove any debris from the charging port on the bottom of your device.

If your iPhone or iPod touch won't charge - Apple Support