Producing a video from snippets is done with a video editor. There are a bunch of video editor applications out there, from trivial to super sophisticated. From freeware to many thousand dollar software.
There is the free
Windows Movie Maker for up to Windows 8.1. Non-linear editing but bad output quality.
There is free
avidemux. Only linear editing, but good output quality.
One of these two should be able to create your first video. To add a title or other fancy stuff, use OBS to compose a snippet that includes it. Play a video as video source within OBS, add a text source to show some text and re-record the video with the overlaid text.
Other choices look for "video editor" at google. Often used software seems Sony Vegas, or Magix. Software that does more than just cutting scenes and append them to each other usually cost money.