[mothered]

seems so many things to learn and quite vague what to do,
but thanks for suggestions!

There certainly Is a lot to learn.

My knowledge spans over a 30 year period, with many ups and downs. There's no time frame to complete a given task, so be sure to take all the time you need before moving forward.

thanks for kind reply.
but what would you recommend for a first step?
and can you guide me a fast learning track?
for example, learn python, network, etc (the more specific, the better)

You're welcome.

As said, take your time during the learning process, there's no rush whatsoever nor any deadlines to meet. In terms of programming tutorials/guides, the net provides countless resources.