To "put together" or merge a video file like with other clips, you can use several free and accessible tools depending on your platform. Quick Online Tools (No Installation)

: A high-quality tool that allows you to stitch clips together and trim them directly in your browser.

: Highly recommended for beginners who want professional-looking transitions between clips.

Since a full movie like Blutzbrüdaz is likely a large file, desktop software is more reliable:

: Works on all operating systems (Windows, Mac, iOS, Android) and supports files up to 500 MB for free.