use dex2jar from https://sourceforge.net/projects/dex2jar/ to get a jar file from your dex file
https://github.com/DexPatcher/dex2jar/releases is more up to date and worket in August 2020
You can browse the content of the jar with jd-gui -> http://java-decompiler.github.io/
brew install apktool
use apktool -d do unpack the apk file so you can look at the Manifest file for instance…