: Remove unnecessary sections from the clips to keep the story focused.

: A simple online joiner that works on any operating system without requiring an installation, supporting files up to 500 MB for free.

or Avidemux : Desktop options for more advanced users that can merge files without re-encoding, preserving the original video quality. General Steps to Create Your Story

To "put together" or merge MP4 video files like into a cohesive story, you can use several free online or desktop tools. Recommended Tools for Merging MP4s