How do you mash two videos together?

To MASH two videos together, you can use video editing software like Adobe Premiere Pro, Final Cut Pro, or free options like iMovie or DaVinci Resolve. Import both videos into the software, place them on separate tracks in the timeline, and align them as desired. You can apply transitions, adjust the audio levels, and trim the clips for a seamless blend. Finally, export the combined video in your preferred format.