If reading even the first part of this series doesn't help, read this beginner tutorial I recently wrote: https://yasoob.me/posts/reverse-engineering-android-apps-apk... It starts you off with the basics and uses smali.

After that you can explore this tutorial on frida: https://securitygrind.com/bypassing-android-ssl-pinning-with... These two techniques will give you some more basic knowledge of how app reversing is done. :)