Static Analysis

Remember always check the AndroidManifest.xml file

Tools

APKtool : https://github.com/iBotPeaches/Apktool

Jadix Decompile : https://github.com/skylot/jadx

APKLab on VSCode : https://github.com/APKLab/APKLab

Dex2Jar : https://github.com/pxb1988/dex2jar

JD-Gui Decompile : http://java-decompiler.github.io/