Change window button layout and window decoraation theme in Gnome 3:

Got the answer from

I know 2 methods:
Using gnome-tweak-tool (Shell >> Arrangement of buttons on the titlebar)
Using dconf

Here are some dconf examples

Only the close button on the left side (i prefer this)
dconf write /org/gnome/shell/overrides/button-layout '"close:"'

Minimize, maximize, close on the right side
dconf write /org/gnome/shell/overrides/button-layout '":minimize,maximize,close"

Change theme: answer from

run: "dconf-editor", navigate to org > gnome > desktop > wm > preferences and change the "theme" value from "Adwaita" to any other installed theme you want. Remember this because in the same place you can also change the window button layout, among others.