OKAY. Did it!!
Picture is shown. Code is recognized, also when I change some things and refresh the browser is reacting correct.
I installed chrome of course. Firefox also!! works and is opened automatically when I click the server adress link you see here:
I would keep all my media files in the project folder, I did not get it right, when having in mind that the pics should be located elsewhere where we talked about a server. I misunderstood that, I guess.
At the moment I would go with Visual Studio Code and Chrome/Firefox. Just because I know VSC a bit. If there is a better combination for working with p5 please let me know…
I would prefer to stay in a local folder, rather than using the online p5 editor to start working right away with the intended implementation of media files (Pics and audio).
Hope that direction is okay so far with your great advice!!