Hello,
is is hard/complex to use networkfeatures of Unity? What is the best way to start? Are there any video-tutorials?
I’d recommend SteamisM50’s tutorials on youtube to start with - though he doesn’t do a great job of how the components each work, all the code he shows in his videos work and you can stream them at a quality where you can actually read the code.
http://www.youtube.com/watch?v=aqbato9Y7vY - setting up server / connection gui
http://www.youtube.com/watch?v=1YS8BDjFvIs - actually adding synchronized player objects
there’s more on adding chat systems and a lobby.
There is also Leepo’s Zero to Hero networking guide.
Cheers 