ADB help

[AKidWithMidgetFriend]

Recently I've been trying to use ADB to expand my searching and editing capabilities. However, I'm not familiar with the program, and I'm still unsure on what command would display a phones current runtime activity or the coding being called by a given app.

Could any of my fellow GG forum members provide some insight on some useful commands? I think the command I'm looking for would be "debug" but I going through the process of setting that up would be a bit redundant when I'm not entirely sure if it'll even be of use.

I figured there would be less redundancy by getting a confirmation here, so if it isn't the debug command then I'll already have someone pointing me in the right direction, opposed to wandering aimlessly through ADB help.

THANK YOU IN ADVANCE TO ANYONE THAT RESPONDS