Ok if you are on a Mac the question is fairly easy, just go with imovie, which is by far the easiest and powerful tool to get a decent video ready in a short period of time.
On Windows, because I do switch often between system I would advice you strongly to try out VSDC. Even though it seems to have a paid version, the free one is full of features packed in a decent interface.
Otherwhise I love Premiere Rush. Adobe took the basic for youtubers and video wannabe alike to make a powerful and straitgthforward tool for newbies and savvy alike.