Why my phone is not charging?

@habeshanprince a bad battery is always a possibility. Of course, make sure you have a good charger and charging cable. Make sure that it supplies the proper voltage and has not bend, broken or corroded connector. Also check the charging port for debris, corrosion. If that still won't work, replacing the charging connector would be next on my list. Guides are available at sites like this

While you work on your battery and charging connector, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!