Newbie into modding, looking for some pointers

[kazeoka]

Hi friends, it's been years now since I've been enjoying modded apps. Lately, after not finding a modded app I wanted, I decided to embark into a journey to learn modding and do it myself. Though as you may have guessed, it's easier said than done. I wanted to share with you my progress so far, and get some pointers, if I am close to reach something or not at all. Here's a few screenshots of where I am at. I thank you in advance for your help.

 

[nightmoonlight]

can tell us how to do it? Can you write a step-by-step progress or recommend us what guide should we follow?
One more thing, if you can, please read this thread and help me too

https://blackmod.net/threads/how-to-update-an-old-mod-apk.30895/

(As the above title, @Legend always update our favourite games too slow (Valkyrie Connect) as an example. So how can I update version for an mod apk by myself? For example, update the mod file of Valkyrie Connect version 09.59.0 to 09.60.0 ?)
Thank you.