Is it possible to create my own programm-sequences for LEGO BOOST MOCs on Windows PC?
Is there an APP for Windows, which I can use to connect?
Or is it just possible with smartphone/tablet? If yes: Which App can I use instead of the LEGO BOOST App? (because the LEGO BOOST App is just for the 5 plans from Lego and there is no creative mode)
Yep! Most Lego devices will run Python, and you can code in Python on Windows, Mac or Linux.
https://m.youtube.com/watch?v=QLL7EegBGr0