Trouble getting informations about saving my desktop


I have a trouble saving my i3 desktop, I wanted to automatically load things like a htop, music player etc. after a boot, but after almost 2 days of searching I’m still confused.

Should I use i3-save-tree ? Is it event meant to do what I want ? If yes could you explain me step by step how to achive my goal and/or maybe link some good tutorials because I have trouble searching right things. (I already saw “i3: Layout saving in i3” but still have no idea how to get things to work")

I found this tutorial but ofcourse it didn’t worked for me

Have you looked at this?

But it won’t save the proportions, windows layout and sizes, at least not for me.