How do you cut parts out of your videos?

So i'm pretty new to windows movie maker and i want to use it to edit my videos for youtube. So i can use the files and i have the video i want to edit but i want to cut little parts out. I was using the "cut" tool but i couldn't understand it. I realised the trim tool was more for where you want it to start and end but i dont really want that. It's also more confusing because i dont want to cut a whole scene out either Could someone please help? Thanks :D