Getting and setting window size and position

[Jack]

What is a reliable method to programmatically get and later set the exact
geometry (position and dimensions) of an window under X11 on a Linux Debian
XFCE4 system?

I've attempted to use wmctrl, xdotool, and xwininfo without success. The
results are inconsistent, or I am potentially misunderstanding their usage.
Could you recommend a more straightforward solution OR clarify how to use
these tools effectively by giving a simple example how to do it?
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