After some tips on this forum, I gave Filmora 9 a try. After ust one hour of trying and testing, I was able to cut, shorten, insert, trim (even the music!) the video, add (sub)titles and my own music! I was very surprised it was that easy! After two days of testing, I decided to buy it, to get rid of the watermark. Got another tip: uninstall it and you will get an offer for 40% discount! 
So, if you are new to editing, I can highly recommend Filmora 9 from Wondershare! As easy as that!
Best regards,
Old Sparky

So, if you are new to editing, I can highly recommend Filmora 9 from Wondershare! As easy as that!
Best regards,
Old Sparky